【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