①10.5﹣2.5x=1.5
②:x=:
③x+x=42
5.04+4.6=
× =
16×30%=
﹣ =
10× ÷10× =
3.2× =
5÷0.1=
0.23=
=
0.71 1.5小时90分
10
8
5
1
3
2
6
0.25×3.2= + = 0.7÷0.01= 9.04+0.6=
-0.375= 13÷91= 10÷20%= 0.81× =