4x﹣1=2.6
x:3.5=3:7
1.2:x=4:2.5
8:x=7:0.5
3.2:0.2=x:
①25×40%=
②÷6=
③×0=
④1÷99%×99%=
⑤×15=
⑥4.8×=
⑦=
⑧0÷=