x/3-y/7=1/2 x/3+y/7=1/3用加减法怎么解?
问题描述:
x/3-y/7=1/2 x/3+y/7=1/3用加减法怎么解?
答
x/3-y/7=1/2 x/3+y/7=1/3
相加
x/3+x/3=1/2+1/3
2x/3=5/6
x=5/4
相减
y/7+y/7=1/3-1/2
2y/7=-1/6
y=-7/12
x=5/4,y=-7/12