Question

x/3-y/7=1/2 x/3+y/7=1/3用加减法怎么解?

Answer 1

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