①15-150%x=12 ②40%x+0.5x=7.2
5000÷100=
0.8×12=
5.22+5.42=
0.56÷700=
×8=
0÷=
125×8=
×=
0.23+177%=
1÷(40×)=
①x:1.25= 0.4:
②75%x+3.6=5.1
1.2x-4=8
①0.7∶18=21∶x
②
③∶x=2∶5
④∶=∶x
⑤
⑥