0.3x+0.2y=1 解方程组{ 5x+7y=40
0.3x+0.2y=1 解方程组{ 5x+7y=40
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解方程组.0.7x+0.3y=1 -7x+2y=5
解关于X,Y的方程组 {x+y=a (a-1)x+y=5
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
阅读下面方程组的解法:解方程组{x/5=y/7,x+y=-36
解方程组{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5)
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6
2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组
解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51
方程组3X-5Y=-2 和2X+7Y=40中X和Y的解
解方程组2x+y-z=7 x+y+z =1 2x-y-z=5