计算:1.( x^2-4x-21 )除以(x-7) 2.[(m+n)^2+(m^2+n^2)]
计算:1.( x^2-4x-21 )除以(x-7) 2.[(m+n)^2+(m^2+n^2)]
计算:1.[(m+n)(n-m)-(m+n)^2+3m(m+n)]除以(-2M),其中m=-4,n=2 2.(x+y)(
计算:(m+2n)/(n-m)+n/(m-n)-2m(n-m)和[(x+2)/(x×x-2x)-(x-1)/(x×x-4
计算:(x/y^3)^-2 计算:m+n/m-n除以mn+m^2/2m
已知3M除以X+2-4X-1除以X平方+X-2=2N除以X-1,求M-N
已知x^m=3x^n=2,请计算x^(2m+3n)
1.计算1(m+2n)(m-2n);2(2n+5)(n-3);3(x+2y)²;4(2x+b)(3x+d);
多项式3x^3+8x^2+8x+4除以x^2+mx+n=3x+2余7x+6,求m,n的值
如果x的4m+n次方除以x的3m-n次方等于x^5,求2m+4n-8
1.已知x^m=4,x^n=8,求x^3m*x^3n+x^3m-n的值 2.计算:(1)-3(a-b)^2*[2(a-b
(x+y)(m+n)2-(x+y)(m+n)2
计算(1)(3m-4n)(3m+4n)-(2m-2n)(2m+n) (2)(x+5y)²-(x-5y)