用加减法解方程组(1){2X+Y=1,X-Y=2 (2){2X+3Y=11,X-2Y=2 (3)X+2Y=1,3X-2Y
用加减法解方程组(1){2X+Y=1,X-Y=2 (2){2X+3Y=11,X-2Y=2 (3)X+2Y=1,3X-2Y
加减法解方程组(1)x-2y=1,3x+2y=11.(2)2x-y=3,3x+y=7
用加减法解方程组{2X+4Y=15,2X-3Y=1
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
方程组3x+2y=1 2x-5y=7用加减法解题
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
用加减法解下列方程组 3(x+y)-4(x-y)=1 (x+y)/2+(x-y)/6=1
解方程组{ 3x-4y(x-y)=3 { 2x-3y=1
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)
数学书解方程组{2(x+y)-(x-y)=3,(x+y)-2(x-y)=1
解方程组:2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16