【10道计算题求解答有过程谢谢3(3a²-2a+1-查字典问答网
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  【10道计算题求解答有过程谢谢3(3a²-2a+1)-(5a²-3a-1)b^m·b^m+1·b^2m÷b3(a^3)^4+a^9·a^3-2(a^2)^6(2x^3y)²·x^3y+(-14x^6)·(-xy)^3因式分解x²(x-y)+y²(y-x)x²y^4-16x²2x(a-b)-(b-a)(x&】

  10道计算题求解答有过程谢谢

  3(3a²-2a+1)-(5a²-3a-1)

  b^m·b^m+1·b^2m÷b

  3(a^3)^4+a^9·a^3-2(a^2)^6

  (2x^3y)²·x^3y+(-14x^6)·(-xy)^3

  因式分解

  x²(x-y)+y²(y-x)

  x²y^4-16x²

  2x(a-b)-(b-a)

  (x²-2xy)²+2y²(x²-2xy)+y^4

  先化简,在求值

  8m²-5m(-m+3n)+4m(-4m-5/2n),其中m=2,n=-1;

  (2xy-3)(2xy+3)+(xy+3)²,其实x=1/5,y=-2

1回答
2020-05-01 04:24
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  3(3a²-2a+1)-(5a²-3a-1)

  =9a²-6a+3-5a²+3a+1

  =4a²-3a+4

  b^m·b^m+1·b^2m÷b

  =b^m·b^2m·b^m+1÷b

  =b^m·b^2m·b^m+1-1

  =b^m+2m+m

  =b^4m

  3(a^3)^4+a^9·a^3-2(a^2)^6

  =3a^12+a^(9+3)-2a^12

  =a^12+a^12

  =2a^12

  (2x^3y)²·x^3y+(-14x^6)·(-xy)^3

  =4x^6y^2·x^3y+14x^6·x^3y^3

  =4x^9y^3+14x^9y^3

  =18x^9y^3

  因式分解

  x²(x-y)+y²(y-x)

  =x²(x-y)-y²(x-y)

  =(x-y)(x²-y²)

  =(x-y)(x-y)(x+y)

  =(x+y)(x-y)²

  x²y^4-16x²

  =x²(y^4-16)

  =x²(y²+4)(y²-4)

  =x²(y²+4)(y+2)(y-2)

  2x(a-b)-(b-a)

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

  =(a-b)(2x+1)

  (x²-2xy)²+2y²(x²-2xy)+y^4

  =(x²-2xy+y²)²

  =[(x+y)²]²

  =(x+y)^4

  先化简,在求值

  8m²-5m(-m+3n)+4m(-4m-5/2n),其中m=2,n=-1;

  8m²-5m(-m+3n)+4m(-4m-5/2n)

  =8m²+5m²-15mn-16m²-10m/n

  =-m(3m+15n+10/n)

  代入m=2,n=-1

  原式=-2(6-15-10)

  =-2(-19)

  38

  (2xy-3)(2xy+3)+(xy+3)²,其实x=1/5,y=-2

  (2xy-3)(2xy+3)+(xy+3)²

  =4x²y²-9+x²y²+6xy+9

  =5x²y²+6xy

  =xy(5xy+6)

  代入x=1/5,y=-2

  原式=-2/5(-2+6)

  =-8/5

2020-05-01 04:26:53

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