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初二数学来自计算题附带答案

初二数学来自计算题附带答案

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问题补充说明:一次二次方程也可以 求帮忙

初二数学来自计算题附带答案

氢上资①5√8-2√32+√5360问答0

=5*3√2-2*4√2+5√2

=√2市岩举海(15-8+5)

=12√2

②√6-√3/2-√2/3

=√6-√6/2-√6/3

=√6/6

③(√45+√27)-(√4/3+√125)

=(3√5+3√3)-(2√3/3+5√5)

=-2√5+7√5/3

④(√4a-√50b)-2(√b/2+√9a)

=(2√a-5√2b)-2(√2b/2+3√a)

=-4√a-6√2b

⑤√4x*(√3x/2-√x/6)

=2√x(√6x/2-√6x/6)

=2√x*(√6周记零社x/3)

=2/3*齐周春觉重|x|*√6

⑥(x√y-y√x)÷√xy

=x√y÷√xy-y√x÷√xy

=√x-√y

⑦(3√7+2√3)(2√3-3√7)

=(2√3)^2-(3√7)^2

=12-选达来63

=-51

⑧(√32-3√3)(4√2+√27)

=(4√2-3√3)(4√2+3√3)

=(4√2)^2-(3√3)^2

=32-27

=5

⑨(3√6-√没编武省念面费烧4)?

=(3√6问宗)^2-2*3√6*√4+(物传支源黄啊企属维希√4)^2

=54-12√6+4

=58-12√6

⑩(下巴需余地调动轻间湖1+√2-√3)(1-√2+√3)

=[1+(√2-√3)][1-(√2-√3)]

=1-(√2-成停坐精√3)^2

=1-(2+3+2√6)

=-4-茶著会掌第杂外攻证广2√6

(1)5√12×√18

=5*2√3*3√2

=30√6;

(2)-6√45×(-4√48)

=6*3√只练红又复读感命鲜话没5*4*4√3

=288√15;

(3)√(12a)×√(3a)/4

=√(36a^2)/切坐培目宪读菜次卷措搞4

=6a/4

=3a/2.

5.

x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2

=[x(y+z)-y(x-z)]^2

=(xz+yz)^2

=z^2(x+y)^2

6.

3(a+2)^2+28(a越阻它诗钟乙面+2)-20

=[3(a+2)-2][(a+2)+10]

=(3a+4)(a+12)

7.

(a+投联米达球记改运b)^2-(b-c)^2+a^2-c^2

=(a+b)^2仍独凯孙其转活术全-c^2+a^2-(b-c)^2

=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)

=(a+b-c)(a+b+c+a-b+c)

=2(a+b-c)(a+c)

8.

x(x+1)(x^2+x-1)-2

=(x^2+x)(x^2+x-1)-2

=(x^2+x)^2-(x^2+x)-2

=(x^2+x-2)(x^2+x+1)

=(x+2)(x-1)(x^2+x+1)

9.

9x^2(x-1)^2-3(x^2-x)-56

=9x^2(x-1)^2-3x(x-1)-56

=[3x(x-1)-8][3x(x-1)+7]

=(3x^2-3x-8)(3x^2-3x+7)

有理数练习

练习一(B级)

(一)计算题:

(1)23+(-73)(2)(-84)+(-49)(3)7+(-2.04)(4)4.23+(-7.57)(5)(-7/3)+(-7/6)(6)9/4+(-3/2)(7)3.75+(2.25)+5/4(8)-3.75+(+5/4)+(-1.5)

5.

x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2

=[x(y+z)-y(x-z)]^2

=(xz+yz)^2

=z^2(x+y)^2

6.

3(a+2)^2+28(a+2)-20

=[3(a+2)-2][(a+2)+10]

=(3a+4)(a+12)

7.

(a+b)^2-(b-c)^2+a^2-c^2

=(a+b)^2-c^2+a^2-(b-c)^2

=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)

=(a+b-c)(a+b+c+a-b+c)

=2(a+b-c)(a+c)

8.

x(x+1)(x^2+x-1)-2

=(x^2+x)(x^2+x-1)-2

=(x^2+x)^2-(x^2+x)-2

=(x^2+x-2)(x^2+x+1)

=(x+2)(x-1)(x^2+x+1)

9.

9x^2(x-1)^2-3(x^2-x)-56

=9x^2(x-1)^2-3x(x-1)-56

=[3x(x-1)-8][3x(x-1)+7]

=(3x^2-3x-8)(3x^2-3x+7)

1.125*3+125*5+25*3+25

2.9999*3+101*11*(101-92)

3.(23/4-3/4)*(3*6+2)

4.3/7×49/9-4/3

5.8/9×15/36+1/27

6.12×5/6–2/9×3

7.8×5/4+1/4

8.6÷3/8–3/8÷6

9.4/7×5/9+3/7×5/9

10.5/2-(3/2+4/5)

11.7/8+(1/8+1/9)

12.9×5/6+5/6

13.3/4×8/9-1/3

14.7×5/49+3/14

15.6×(1/2+2/3)

16.8×4/5+8×11/5

17.31×5/6–5/6

18.9/7-(2/7–10/21)

19.5/9×18–14×2/7

20.4/5×25/16+2/3×3/4

21.14×8/7–5/6×12/15

22.17/32–3/4×9/24

23.3×2/9+1/3

24.5/7×3/25+3/7

25.3/14××2/3+1/6

26.1/5×2/3+5/6

27.9/22+1/11÷1/2

28.5/3×11/5+4/3

29.45×2/3+1/3×15

30.7/19+12/19×5/6

31.1/4+3/4÷2/3

32.8/7×21/16+1/2

33.101×1/5–1/5×21

34.50+160÷40

35.120-144÷18+35

36.347+45×2-4160÷52

37(58+37)÷(64-9×5)

38.95÷(64-45)

39.178-145÷5×6+42

40.812-700÷(9+31×11)

41.85+14×(14+208÷26)

43.120-36×4÷18+35

44.(58+37)÷(64-9×5)

45.(6.8-6.8×0.55)÷8.5

46.0.12×4.8÷0.12×4.8

47.(3.2×1.5+2.5)÷1.6

48.6-1.6÷4=5.38+7.85-5.37=

49.7.2÷0.8-1.2×5=6-1.19×3-0.43=

50.6.5×(4.8-1.2×4)=

51.5.8×(3.87-0.13)+4.2×3.74

52.32.52-(6+9.728÷3.2)×2.5

53.[(7.1-5.6)×0.9-1.15]÷2.5

54.5.4÷[2.6×(3.7-2.9)+0.62]

55.12×6÷(12-7.2)-6

56.12×6÷7.2-6

57.0.68×1.9+0.32×1.9

58.58+370)÷(64-45)

59.420+580-64×21÷28

60.136+6×(65-345÷23)

15-10.75×0.4-5.7

62.18.1+(3-0.299÷0.23)×1

63.(6.8-6.8×0.55)÷8.5

64.0.12×4.8÷0.12×4.8

65.(3.2×1.5+2.5)÷1.6

66.3.2×6+(1.5+2.5)÷1.6

67.0.68×1.9+0.32×1.9

68.10.15-10.75×0.4-5.7

69.5.8×(3.87-0.13)+4.2×3.74

70.32.52-(6+9.728÷3.2)×2.5

71.[(7.1-5.6)×0.9-1.15]÷2.5

72.5.4÷[2.6×(3.7-2.9)+0.62]

73.12×6÷(12-7.2)-6

74.12×6÷7.2-6

75.33.02-(148.4-90.85)÷2.5

1)76.(25%-695%-12%)*36

77./4*3/5+3/4*2/5

78.1-1/4+8/9/7/9

79.+1/6/3/24+2/21

80./15*3/5

81.3/4/9/10-1/6

82./3+1/2)/5/6-1/3]/1/7

83./5+3/5/2+3/4

84.(2-2/3/1/2)]*2/5

85.+5268.32-2569

86.3+456-52*8

87.5%+6325

88./2+1/3+1/4

2)89+456-78

3)5%+.3/7×49/9-4/3

4)9×15/36+1/27

5)2×5/6–2/9×3

6)3×5/4+1/4

7)94÷3/8–3/8÷6

8)95/7×5/9+3/7×5/9

9)6/2-(3/2+4/5)

10)8+(1/8+1/9)

11)8×5/6+5/6

12)1/4×8/9-1/3

13)10×5/49+3/14

14)1.5×(1/2+2/3)

15)2/9×4/5+8×11/5

16)3.1×5/6–5/6

17)4/7-(2/7–10/21)

18)19×18–14×2/7

19)5×25/16+2/3×3/4

20)4×8/7–5/6×12/15

21)7/32–3/4×9/24

22)1、2/3÷1/2-1/4×2/5

2、2-6/13÷9/26-2/3

3、2/9+1/2÷4/5+3/8

4、10÷5/9+1/6×4

5、1/2×2/5+9/10÷9/20

6、5/9×3/10+2/7÷2/5

7、1/2+1/4×4/5-1/8

8、3/4×5/7×4/3-1/2

9、23-8/9×1/27÷1/27

10、8×5/6+2/5÷4

11、1/2+3/4×5/12×4/5

12、8/9×3/4-3/8÷3/4

13、5/8÷5/4+3/23÷9/11

23)1.2×2.5+0.8×2.5

24)8.9×1.25-0.9×1.25

25)12.5×7.4×0.8

26)9.9×6.4-(2.5+0.24)(27)6.5×9.5+6.5×0.5

0.35×1.6+0.35×3.4

0.25×8.6×4

6.72-3.28-1.72

0.45+6.37+4.55

5.4+6.9×3-(25-2.5)2×41846-620-380

4.8×46+4.8×54

0.8+0.8×2.5

1.25×3.6×8×2.5-12.5×2.4

28×12.5-12.5×20

23.65-(3.07+3.65)

(4+0.4×0.25)8×7×1.25

1.65×99+1.65

27.85-(7.85+3.4)

48×1.25+50×1.25×0.2×8

7.8×9.9+0.78

(1010+309+4+681+6)×12

3×9146×782×6×854

5.15×7/8+6.1-0.60625

1.3/7×49/9-4/3

2.8/9×15/36+1/27

3.12×5/6–2/9×3

4.8×5/4+1/4

5.6÷3/8–3/8÷6

6.4/7×5/9+3/7×5/9

7.5/2-(3/2+4/5)

8.7/8+(1/8+1/9)

9.9×5/6+5/6

10.3/4×8/9-1/3

11.7×5/49+3/14

12.6×(1/2+2/3)

13.8×4/5+8×11/5

14.31×5/6–5/6

15.9/7-(2/7–10/21)

16.5/9×18–14×2/7

17.4/5×25/16+2/3×3/4

18.14×8/7–5/6×12/15

19.17/32–3/4×9/24

20.3×2/9+1/3

21.5/7×3/25+3/7

22.3/14××2/3+1/6

23.1/5×2/3+5/6

24.9/22+1/11÷1/2

25.5/3×11/5+4/3

26.45×2/3+1/3×15

27.7/19+12/19×5/6

28.1/4+3/4÷2/3

29.8/7×21/16+1/2

30.101×1/5–1/5×21

31.50+160÷40(58+370)÷(64-45)

32.120-144÷18+35

33.347+45×2-4160÷52

34(58+37)÷(64-9×5)

35.95÷(64-45)

36.178-145÷5×6+42420+580-64×21÷28

37.812-700÷(9+31×11)(136+64)×(65-345÷23)

38.85+14×(14+208÷26)

39.(284+16)×(512-8208÷18)

40.120-36×4÷18+35

41.(58+37)÷(64-9×5)

42.(6.8-6.8×0.55)÷8.5

43.0.12×4.8÷0.12×4.8

44.(3.2×1.5+2.5)÷1.6(2)3.2×(1.5+2.5)÷1.6

45.6-1.6÷4=5.38+7.85-5.37=

46.7.2÷0.8-1.2×5=6-1.19×3-0.43=

47.6.5×(4.8-1.2×4)=0.68×1.9+0.32×1.9

48.10.15-10.75×0.4-5.7

49.5.8×(3.87-0.13)+4.2×3.74

50.32.52-(6+9.728÷3.2)×2.5

51.[(7.1-5.6)×0.9-1.15]÷2.5

52.5.4÷[2.6×(3.7-2.9)+0.62]

53.12×6÷(12-7.2)-6(4)12×6÷7.2-6

102×4.5

7.8×6.9+2.2×6.9

5.6×0.25

8×(20-1.25)

1)127+352+73+44(2)89+276+135+33

(1)25+71+75+29+88(2)243+89+111+57

9405-2940÷28×21

920-1680÷40÷7

690+47×52-398

148+3328÷64-75

360×24÷32+730

2100-94+48×54

51+(2304-2042)×23

4215+(4361-716)÷81

(247+18)×27÷25

36-720÷(360÷18)

1080÷(63-54)×80

(528+912)×5-6178

8528÷41×38-904

264+318-8280÷69

(174+209)×26-9000

814-(278+322)÷15

1406+735×9÷45

3168-7828÷38+504

796-5040÷(630÷7)

285+(3000-372)÷36

1+5/6-19/12

3x(-9)+7x(-9

(-54)x1/6x(-1/3)

1.18.1+(3-0.299÷0.23)×1

2.(6.8-6.8×0.55)÷8.5

3.0.12×4.8÷0.12×4.8

4.(3.2×1.5+2.5)÷1.6(2)3.2×(1.5+2.5)÷1.6

5.6-1.6÷4=5.38+7.85-5.37=

6.7.2÷0.8-1.2×5=6-1.19×3-0.43=

7.6.5×(4.8-1.2×4)=0.68×1.9+0.32×1.9

8.10.15-10.75×0.4-5.7

9.5.8×(3.87-0.13)+4.2×3.74

10.32.52-(6+9.728÷3.2)×2.5

11.[(7.1-5.6)×0.9-1.15]÷2.5

12.5.4÷[2.6×(3.7-2.9)+0.62]

13.12×6÷(12-7.2)-6

14.12×6÷7.2-6

15.33.02-(148.4-90.85)÷2.5

7×(5/21+9/714)

a^3-2b^3+ab(2a-b)

=a^3+2a^2b-2b^3-ab^2

=a^2(a+2b)-b^2(2b+a)

=(a+2b)(a^2-b^2)

=(a+2b)(a+b)(a-b)

2.

(x^2+y^2)^2-4y(x^2+y^2)+4y^2

=(x^2+y^2-2y)^2

3.

(x^2+2x)^2+3(x^2+2x)+x^2+2x+3

=(x^2+2x)^2+4(x^2+2x)+3

=(x^2+2x+3)(x^2+2x+1)

=(x^2+2x+3)(x+1)^2

4.

(a+1)(a+2)+(2a+1)(a-2)-12

=a^2+3a+2+2a^2-3a-2-12

=3a^2-12

=3(a+2)(a-2)

5.

x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2

=[x(y+z)-y(x-z)]^2

=(xz+yz)^2

=z^2(x+y)^2

6.

3(a+2)^2+28(a+2)-20

=[3(a+2)-2][(a+2)+10]

=(3a+4)(a+12)

7.

(a+b)^2-(b-c)^2+a^2-c^2

=(a+b)^2-c^2+a^2-(b-c)^2

=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)

=(a+b-c)(a+b+c+a-b+c)

=2(a+b-c)(a+c)

8.

x(x+1)(x^2+x-1)-2

=(x^2+x)(x^2+x-1)-2

=(x^2+x)^2-(x^2+x)-2

=(x^2+x-2)(x^2+x+1)

=(x+2)(x-1)(x^2+x+1)

写完一遍后再别这些题写一遍,以此类推,老师们看作业都是一看而过不会一个一个批的。