解下列方程组：{①二分之x-三分之y=六分之五,②x-2y=-3.

x/2-y/3=5/6
x-2y=-3
3x-2y=5
x=2y-3
3(2y-3）-2y=5
6y-9-2y=5
4y=9+5=14
y=7/2
x=2y-3=2*7/2-3
x=4
x=4
y=7/2这个第一个吗，那第二个呢（x+y)/3-(x-y)/4=3x/3+y/2=3 4x+4y-3x+3y=3*12=362x+3y=3*6=18 x+7y=362x+3y=18 2(36-7y)+3y=1872-14y+3y=18y=54/11 x=36-7y=36-7*54/11x=18/11