解方程组 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
解方程组(三分之x+y)+y=6,3(x+y)-y=24
解方程组x+y/3=x-y/4 2x+3y=11
3(x+y)-4(x-y)=11 2(x-y)+5(x+y)=27 解这个两元一次方程组
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27
已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
解方程组:4(x+1)=3(y+3) x-2y=7y-6x/3
解方程组(3x+2y)/4=x+3/4y=3(x-2)+y
解方程组:3x+y=9和10x-11y=30,x+2y+4z=17和2x+y+z=7和3x+y+2z=11(写过程)
解方程组(1)2x+3y=12 ,2x+y=0 (2)x+y=7,3(x+y)-7y=7