解方程组(1)3x+y=82x-y=7
解方程组(1)3x+y=82x-y=7
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(1)2x+3y=12 ,2x+y=0 (2)x+y=7,3(x+y)-7y=7
解方程组:4(x+1)=3(y+3) x-2y=7y-6x/3
解方程组(三分之x+y)+y=6,3(x+y)-y=24
加减法解方程组(1)x-2y=1,3x+2y=11.(2)2x-y=3,3x+y=7
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
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1