x﹣1=
0.52x﹣0.17x=0.21
:x=:
①1300﹣497=
②0.81+15.3=
③=
④30%×=
⑤=
⑥14:0.7=
⑦2.4÷=
⑧1÷﹣÷1=
x﹣1=0.2
x:=21:
50%x+x=15
3(x﹣5)=8.4
(只)