3x 7y=36怎么算

3x 7y=36怎么算 (y-x)(x-y)^3(y-x)^5怎么算 y/(x+y)-x/(x-y)=?怎么算? x+x+x+y+y=6.4 y+y+y+x+x=7.1 怎么算? 7x-3y=-1 4x-5y=-17方程组怎么算? 7x-3y=-1怎么变形?y=? 5x+2y=52=3x+2y=36怎么算? 3x+2y=36=5x+2y=72怎么算? 请问算到4x/y=3y/x后怎么算出x,y, 7x-4y=3 y+7x=8怎么算 {5x+4y=7 {7x+3y=15 怎么算 3x+2y=7 5x-y=3 怎么算 4x+3y=1 x=y=7/1 怎么算的 x-5y=0,3x+7y=44的解怎么算 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. 二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算 3x+2y=36怎么算? x+y=20 3x=y 怎么算 尤其是3x=y怎么做 (7x+y)(7x-y)-(-x+y)(x-y) 用乘法公式计算 怎么算?