计算:(1)(-2y²)³+y×y^5 (2)[(m+3n)²-(m-3n)²]
计算(1)(3m-4n)(3m+4n)-(2m-2n)(2m+n) (2)(x+5y)²-(x-5y)
计算:(x/y^3)^-2 计算:m+n/m-n除以mn+m^2/2m
计算:【(x-y)/(m-n)】的立方×【(n-m)/(y-x)】的四次方×【(2m-2n)/3y-3x】的平方
几道分式计算.【1】[1/(m+n)^2-1/(m-n)^2]÷(1/m+n-1/m-n)【2】2/3x-(2/x+y)
因式分解m²+2m(m-n)+(m-n)²,16-8(x-y)+(x-y)²
计算:①2m²-m(2m-5n)-n(5m-n)②(3x-y)²-(3x+y)²-2xy③
1.计算1(m+2n)(m-2n);2(2n+5)(n-3);3(x+2y)²;4(2x+b)(3x+d);
1、4m-7n-2(m-2n) 2、-(x²-2xy-y²)+(5x²-2xy-3y
1、(m-n-3)² 2、x³y-4x²y²+3xy³
因式分解:(1)18(m+n)²-2(m-n)² (2)2y-3x-9x²+4y²
已知M=3x²-2xy+y²,N=2x²+xy-3y²,求:(1)M-N; (2
已知x=2m-3n根号m+n+3是m+n+3的算术平方根,y=m-n+1根号m+2n是m+2n的立方根,求(x-y)的2