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&
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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
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&
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