看在那么高分的份上,就解了
3.(0.84+0.24)y*0.25=(x-0.84)*0.9y
1.08*0.25=(x-0.84)*0.9
x=1.14
4.4/7x-100=3/7x+100
1/7x=200
x=1400
5.1.25x×0.8=64
1.25x=80...
看在那么高分的份上,就解了
3.(0.84+0.24)y*0.25=(x-0.84)*0.9y
1.08*0.25=(x-0.84)*0.9
x=1.14
4.4/7x-100=3/7x+100
1/7x=200
x=1400
5.1.25x×0.8=64
1.25x=80...