计算 ① 3(2-y)²-4(y+5)² ② (m-n-1)·(m-n+1)
计算(1)(3m-4n)(3m+4n)-(2m-2n)(2m+n) (2)(x+5y)²-(x-5y)
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);
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)
1、4m-7n-2(m-2n) 2、-(x²-2xy-y²)+(5x²-2xy-3y
(1)(2x+y)²-(x+2y)² (2)(m+n)²-4m(m+n)+4m ²
已知-3x的m-2n次方×y的n-2次方和1/5x^5乘y的4-n是同类项,求(m-2n)的2次方-5(m+n)-2(m
计算:(x/y^3)^-2 计算:m+n/m-n除以mn+m^2/2m
已知-3x的m-2n次方×y的n-2次方和1/5x^5乘y的4-m是同类项,求(m-2n)的2次方-5(m+n)-2(m
已知-4x^(5m)y^(3m-n)/(-2x^(m+2n)y^(2m+n))的商与-1/2x^6y^3是同类项,求m^
计算:x·x²·x的n次方-x的n+3次方;y·y的m+1次方·y的m-1次方-y的2m+1次方.
集合M={X=3m+1,m∈N*},N={y/y=5n+2,n∈N*},则M∩N=?