解方程3x+2y= 5x+2 2[3x+2y]=3x+18
解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
解方程3x+2y= 5x+2 2[3x+2y]=3x+18
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
求方程x+2y-3x=4,3x-2y+x=6,3x+2y-5x=8的解
(x+y)-(x+y)平方 因式分解 解方程 2x²=3x (3x-1)² - 4=0 5x-15x
解方程 2x+3y=21 5x+4y=59 12x+5y=99 2x+3y=18 2x+3y=24 8x+5y=51 5
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
解方程{2x+3y=7 {3x-5y=-18
解方程y²-3x²+x+1=0,2x-y=1