计算(1)(3x+4)(3x-4) (2)(2x+1)(2x+3) (3)(9x+4y)(9x-4y)
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
计算 1.(-2x)^3-3x乘(x-2x^2) 2.【(x+2y)^2-(x-2y)(x+2y)】÷4y
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
计算:(x-4y)(2x+3y)-(x+2y)(x-y).
计算:(2/3x根号下9x+6x根号下y/x)+(y根号下x/y-x的平方根号下1/x)=
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
因式分解:(1)x²+x (2)4x²-9y (3)x²y-4y
通分计算:(1)2x-3/(x-1)(x-4) - x-2/(1-x)(4-x) (2)x平方-y平方/xy - xy-
计算(x*x+4x+5)/(x+2)-(x*x+6x+10)/(x+3)+1
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(3x-y)²-2x(4x-5y)-(x+2y)²