计算:(1)(3y-1)(2y+3)-(6y-5)(y-4)(2)(a-b+1)(a+b-1)
计算 1、(a-b)^3*(a-b)^4*(b-a)^3 2、y^(m+2)*y*y^(m-1)+y^(2m+2) 3、
计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
1)已知4X=5y,求(X+y):y 2)已知(a-b):(a+b)=3:7,求a:b
计算:1、(2a-3b)(2a+3b)(-4a²-9b²) 2、(x-2y+3)(x+2y-3)
计算:1:(2a-3b-c)^2 2:(3y-y-1)(y-3x-1) 3:(2x+y-z)(z-2x+y)
(3x-y)(3x+y)+y(x+y);(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)快点,
合并同类项:3b-3a的平方+1+a的三次方-2b,3y+二分之一y,2y+6y+2xy-5
分解因式1.x^2+y^2+2x+6y+10 2.(1-y)^3+4(y-x) 3.(a-c)^2-4(a-b)(b-c
求平方差公式计算 (a+3b)(a-3b) (1-5y)(1+5y) (3+2a)(-3+2a) (4x-5y)(4x+
因式分解:(1)(a+b)²+a+b+1/4 (2)6(x-y)²+3(y-x)³
用乘法公式计算(1)(3a-b)(b+3a)-(2b+a)(-2b-a) (2)(-x-2y)(x+2y)