计算:1-3(x-1/2y²)+(-x+1/2y²)过程,算式!(初一试题)
计算:3x+2y/4=2x+y/5=x-y+1/6.(要求有过程)
初一几道计算忘了.x²-5x=2a(x-2y)-3b(2y-x)-4c(x-2y)=-5x²y
运用乘法公式计算:(1)(x-y)(x+y)-(2x-y)²
计算,不要过程(-2x)(-3x²)²-3a(2a²-5a-1)(2x+3y)(2x-3y
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
1/2x·y·x·x-y·x·x²+x·x·y(求详细过程)急!
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
(x+y)的立方+2x y(1-x-y)-1因式分解要过程
化简算式(4x-2y²)-[5x-(x-y²)]-x