0.8:5=:15.
0﹣10.5;
﹣41﹣31;
1﹣1;
﹣0.750.05.
3.14×20=
2× + =
1+ ﹣ =
( + )×24=
0.15×100=
54÷ =
12.5×8=
99×0.6+0.6=
①0.7:18=21:x
② =
③1.5:2.5=12:x
④ : = :x
⑤ =
⑥ = .
X
3
60
Y
4
0.3
12