1.m/4+n/4=2m/6+n/3=22.(x+3)/2+(y+5)/3=7(x+4)/3-(2y-3)/5=23.(x+y)/2+(x-y)/3=14(x+y)-5(x-y)=24.2(3x-y)=7(2x-3y)/5-(y-3x)/3=1/25.(2x-1)/5+(3y-2)/4=2(3x+1)/5-(3y+2+/4=0(如果你想要更难的,补充问题吧!)
