七年级数学下册计算题21.docx

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七年级数学下册计算题21.docx

七年级数学下册计算题21

(k2-k)-(9k2-5k-1)

(8a2+a-9b)-(7a2+5a-4b)

6x2+(4x2+9x+1)-(x+5)

2y2+(3x2-y)+(3x2-4y2)

5

(6x2-7xy+—x)-(6x2-6xy-8x)

4

74

(—xy-2y2-8)-(x2+—xy-3y2+8)

83

21

(xy-—y-—)+(xy-x-7)

38

(7y+6x+9z2)-(7y+5x-2z2)

(3k2-9k)+(8k2+k+2)

(7a2-8a-2b)-(3a2+2a-3b)

2x2-(6x2+2x-7)-(9x+4)

7y2-(3x2+y)+(6x2-2y2)

1

(7x2+2xy-—x)+(8x2+9xy+4x)

8

15

(—xy-7y2-1)+(x2+—xy-5y2-3)

66

54

(xy+—y-—)-(xy-x-4)

45

(8y+8x-2z2)-(9y-4x+6z2)

(5k2-6k)+(8k2-3k-6)

(a2+4a+8b)-(a2+8a+6b)

2x2-(8x2+7x-2)-(7x-3)

2y2+(x2+y)+(7x2+3y2)

2

(5x2-9xy-—x)+(4x2-5xy-2x)

3

84

(—xy+7y2+6)+(x2+—xy-7y2+6)

73

31

(xy+—y+—)+(xy-x-5)

46

(5y-6x+3z2)-(2y-9x-9z2)

(4k2-5k)-(2k2+3k-9)

(6a2+5a-4b)+(9a2-2a+b)

6x2+(4x2-2x+7)-(2x-3)

9y2-(4x2+y)-(5x2+8y2)

1

(5x2-6xy+—x)-(4x2-xy-4x)

5

51

(—xy-7y2-8)-(x2+—xy+3y2+6)

44

11

(xy+—y+—)-(xy-x-9)

63

(8y+2x-4z2)+(9y+9x+9z2)

(6k2+4k)-(5k2+2k+1)

(6a2+4a+6b)-(7a2-9a+8b)

2x2-(4x2-9x-8)+(9x+8)

3y2-(4x2+y)+(8x2+4y2)

1

(4x2+2xy-—x)+(2x2-9xy+3x)

8

71

(—xy-8y2-1)+(x2-—xy-6y2+3)

67

17

(xy-—y+—)-(xy-x+6)

86

(9y+9x+4z2)-(8y-6x-9z2)

(3k2+5k)+(5k2+5k+7)

(7a2-9a+3b)+(9a2+6a+6b)

5x2-(8x2+3x-7)+(5x+5)

5y2+(6x2-y)-(x2-7y2)

1

(5x2+6xy+—x)+(6x2-5xy+5x)

7

61

(—xy-6y2+4)-(x2-—xy-6y2+8)

76

55

(xy+—y-—)+(xy+x+1)

44

(3y-9x+8z2)+(3y+4x-2z2)

(k2+2k)+(2k2-2k-4)

(4a2+9a-3b)+(8a2+3a+4b)

9x2-(x2-9x+1)+(x-9)

2y2-(7x2-y)-(4x2+4y2)

7

(7x2+5xy+—x)-(x2-6xy-6x)

6

51

(—xy+8y2-3)+(x2-—xy-4y2-8)

68

94

(xy+—y-—)+(xy-x-5)

83

(8y+x-9z2)+(8y-6x+8z2)

(6k2-8k)+(8k2-4k-6)

(2a2-a+4b)+(8a2-a-5b)

6x2+(4x2-2x+6)+(4x-2)

2y2+(8x2+y)+(x2+6y2)

4

(9x2-4xy-—x)+(4x2-7xy+7x)

5

49

(—xy-3y2+8)-(x2+—xy-y2-7)

58

12

(xy+—y+—)-(xy-x+9)

83

(5y+6x+7z2)+(7y+5x+3z2)

(6k2+k)+(4k2+k-7)

(6a2+4a-6b)+(8a2+7a-2b)

5x2-(6x2+6x-4)+(2x+5)

6y2-(9x2+y)+(6x2+y2)

3

(3x2+5xy-—x)-(6x2-9xy+8x)

4

71

(—xy-7y2+4)+(x2+—xy-6y2-8)

84

84

(xy-—y-—)+(xy+x+2)

75

(5y+5x+z2)-(4y+4x-z2)

(7k2-5k)+(7k2-7k-6)

(8a2+4a-2b)-(a2-a-4b)

5x2+(2x2+4x-3)-(x-3)

3y2+(6x2+y)-(2x2+2y2)

1

(2x2+6xy-—x)+(6x2-xy-6x)

4

11

(—xy+4y2-1)+(x2+—xy+y2+9)

47

15

(xy-—y+—)+(xy-x-2)

76

(8y-6x+9z2)+(4y+9x+9z2)

(2k2+9k)+(9k2-7k+1)

(8a2-6a+8b)-(5a2+9a-7b)

4x2-(9x2+7x+2)+(9x-2)

5y2-(2x2-y)+(2x2-6y2)

5

(2x2-8xy+—x)-(9x2+7xy+6x)

4

11

(—xy+5y2+2)+(x2+—xy-y2-3)

66

13

(xy+—y-—)-(xy+x-9)

74

(5y+6x+4z2)+(2y+7x+2z2)

(5k2-3k)+(7k2-4k+8)

(a2+8a-4b)+(a2+9a+8b)

3x2-(6x2+9x+9)+(9x+6)

7y2+(x2+y)+(3x2+4y2)

7

(7x2-5xy+—x)-(9x2-xy+7x)

8

91

(—xy+6y2-5)-(x2+—xy+2y2-5)

83

91

(xy-—y+—)+(xy-x-8)

83

(9y+5x+4z2)-(6y-x+2z2)

(7k2-8k)-(2k2-3k+7)

(7a2+5a-7b)-(7a2-2a+3b)

8x2+(7x2-6x+3)+(4x+6)

4y2-(x2+y)-(2x2+8y2)

9

(7x2-2xy+—x)-(4x2+8xy+8x)

8

21

(—xy-y2+3)-(x2-—xy-2y2+8)

37

53

(xy+—y+—)-(xy-x+6)

64

(y-4x-5z2)+(9y-3x-9z2)

(4k2+k)-(2k2-4k+8)

(8a2+7a+9b)-(5a2+8a-2b)

3x2-(8x2+6x-6)-(2x+9)

3y2-(3x2-y)+(3x2+9y2)

1

(3x2-4xy-—x)+(8x2+xy+5x)

8

15

(—xy-7y2-5)+(x2+—xy-8y2-3)

84

57

(xy-—y+—)+(xy-x-5)

68

(7y+x-z2)-(6y+9x+2z2)

(4k2-k)-(7k2+k-7)

(2a2+5a+9b)+(2a2-2a+2b)

2x2+(9x2-9x+3)+(3x+8)

9y2-(4x2+y)-(4x2+9y2)

7

(7x2+2xy-—x)-(2x2-5xy-3x)

8

12

(—xy-3y2+4)+(x2+—xy+4y2+5)

43

16

(xy-—y-—)-(xy+x+7)

35

(7y-9x+8z2)+(8y+8x-7z2)

(4k2+8k)-(8k2-3k-5)

(3a2-9a-b)-(3a2+8a+8b)

6x2+(3x2+5x+8)+(6x-3)

2y2+(3x2+y)+(8x2+7y2)

6

(3x2-9xy+—x)+(6x2-5xy-x)

7

14

(—xy-4y2-8)+(x2-—xy+y2-2)

85

47

(xy-—y+—)+(xy+x-1)

36

(7y-8x-z2)+(9y-4x+4z2)

(9k2-5k)+(k2+7k-9)

(9a2+7a+2b)+(4a2-2a+3b)

2x2-(9x2-8x+3)+(8x-3)

2y2+(8x2-y)+(3x2-9y2)

8

(8x2+5xy+—x)+(x2-4xy-8x)

7

11

(—xy+4y2+9)+(x2+—xy+5y2-3)

63

36

(xy+—y-—)-(xy-x+6)

47

(y+4x+z2)-(7y+x-7z2)

(k2+7k)-(7k2+4k-8)

(a2-a+6b)-(2a2+8a-2b)

3x2-(3x2-8x-9)-(7x+6)

2y2+(x2+y)+(6x2+7y2)

2

(5x2-5xy-—x)-(3x2+xy-4x)

3

11

(—xy-7y2+6)-(x2+—xy+2y2+1)

38

15

(xy+—y-—)+(xy+x-9)

44

(8y+x-z2)-(8y+9x-6z2)

(8k2-3k)-(k2+7k+6)

(9a2+6a-7b)-(a2-7a+8b)

8x2+(9x2+4x-3)+(3x+7)

3y2-(7x2-y)+(5x2-2y2)

1

(3x2+7xy+—x)-(9x2+9xy-2x)

6

11

(—xy-7y2+2)+(x2+—xy+3y2+3)

85

36

(xy+—y+—)-(xy-x-7)

45

(3y-9x-8z2)+(3y+7x+5z2)

(3k2+5k)+(7k2+2k-6)

(3a2-8a-4b)-(7a2-3a-3b)

5x2+(7x2-2x-6)+(9x-2)

9y2-(6x2-y)-(6x2-2y2)

8

(6x2+2xy-—x)+(4x2+5xy-x)

7

17

(—xy+3y2+1)+(x2-—xy-9y2-3)

48

47

(xy+—y+—)+(xy+x+1)

36

(7y+6x-5z2)+(9y+6x+6z2)

(7k2+9k)-(8k2-7k+4)

(7a2-4a-3b)-(9a2+a+3b)

9x2-(3x2+9x+6)+(4x+7)

6y2+(2x2-y)+(x2-3y2)

1

(9x2+7xy-—x)-(3x2-4xy-5x)

5

17

(—xy+9y2+8)+(x2-—xy-8y2+5)

56

78

(xy+—y-—)-(xy+x+1)

67

(4y-6x+7z2)-(9y-6x-9z2)

(6k2-9k)+(9k2-6k+7)

(9a2-3a+b)+(7a2+a+9b)

x2-(9x2+8x+6)+(x-2)

4y2-(3x2-y)+(3x2+5y2)

1

(8x2+8xy-—x)-(5x2+2xy-4x)

4

16

(—xy-9y2-3)-(x2+—xy-9y2-6)

75

78

(xy+—y+—)-(xy+x-9)

67

(7y+6x+3z2)+(5y+6x-7z2)

(7k2-3k)+(9k2-2k+9)

(9a2-9a-6b)-(8a2-9a+7b)

5x2+(4x2-7x-6)+(7x-5)

y2+(4x2-y)-(4x2+4y2)

3

(5x2-3xy+—x)+(8x2+7xy+2x)

4

62

(—xy-2y2-2)+(x2-—xy+5y2+5)

73

41

(xy+—y-—)+(xy-x-1)

38

(2y-6x-2z2)+(6y+2x-8z2)

(2k2-5k)-(9k2+7k-4)

(5a2-a-3b)-(7a2-3a+9b)

2x2-(4x2-x+2)+(x-4)

y2+(4x2-y)-(x2-3y2)

4

(2x2+5xy+—x)+(5x2-6xy+4x)

5

12

(—xy-6y2-3)-(x2+—xy+9y2-8)

33

84

(xy+—y-—)-(xy-x+7)

75

(6y-6x-9z2)+(y-4x-9z2)

(4k2+8k)+(7k2+8k-7)

(7a2-8a+2b)+(4a2-9a-2b)

x2+(x2+8x-5)+(3x-1)

y2+(5x2-y)-(2x2+2y2)

1

(4x2-3xy+—x)-(3x2+7xy+5x)

6

27

(—xy-9y2+5)+(x2-—xy-5y2+1)

38

65

(xy+—y+—)-(xy+x-4)

76

(8y+x-2z2)-(6y-x+9z2)

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