解方程组(1)3x+7-9=0 (2)3x+y/2+1=3x-2y=2 (3)x+1/3+y/2=1
解方程组(1)2x+3y=12 ,2x+y=0 (2)x+y=7,3(x+y)-7y=7
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:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
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
解方程组:4(x+1)=3(y+3) x-2y=7y-6x/3
解方程组,1、x/2=y/3 3x-5y=9 2、 x-2y=-7 3(x-2)=1-y
解方程组 (1){2x-y=5,x-2y=1 (2){7x+3y=5,-5x+6y=-9
解方程组{ 3x-4y(x-y)=3 { 2x-3y=1
已知方程组2x+y=6 x-3y=1,求7y(x-3y)²-2(3y-x)³的值
解方程组:(x+3)(y-2)=(x-3)(y+10),(x+1)(y+3)=(x-2)(y+12)
解方程组{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5)