2x-y=3(1) 3x+4y=10(2)怎么解

2x-y=-3(1) 3x+4y=10(2)怎么解 2x-y=3(1) 3x+4y=10(2)怎么解 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 解方程组：（0.2x+0.1y）/2- （4x-y）/10=（x-y）/5+ (3x+0.5y)/30 (3x+2y-1 x-y=2y 0.2x+3y=1 这个二元一次方程怎么解? 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 怎么解二元一次方程组2(x-y)/3-x+y/4=-1和6(x+y)-4(2x-y)=16 解方程组:(x+3)(y-2)=(x-3)(y+10),(x+1)(y+3)=(x-2)(y+12) 解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16 解方程组 10（x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16 解二元一次方程组{3(x+y)-4(x-y)=4,x+y/2+x-y/6=1 解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1