解方程租{x/2=y/5 25%x+40%y=1.4,
解方程{2x+y=2、-x+y-5
解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62
2x+5y=25 4x+3y=15 解方程
解方程x*x+xy=y+y*y
解方程{2x-y=6 (x+2y)(2x-y)=96
解方程{5X+2Y=40,5(1+25%)X+2(1+20%)Y=48.5
方程2分之x+y+2分之x-y=7,4(x+y)-5(x-y)=2
解方程:x-x-1/2=2-x+2/3 y+6=y+2/2-y-5/3
解方程:3x+2y/4=2x+y/5=x-y+1/6要详细过程
{4x+7y+7=3x+2y+4,5x+y+1=6x-1解方程租
解方程xy'=(√x^2-y^2)+y
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7