一、口算。
$5-3.7=$
$1.5×7=$
$1.5÷15=$
$320÷2=$
$5.7+2.1=$
$90×11=$
$431-72=$
$6.36÷6=$
$1.73+6.3=$
$3.2×50=$
$190×3=$
$7800÷60=$
$0.96÷6=$
$3.05-1.35=$
$0.64×5=$
$350×20=$
$2.8÷14=$
$10.1×30=$
$8.1÷3=$
$0.35×200=$
$7÷35=$
$2.09+3.44=$
$0.084÷10=$
$12.5×80=$
$2.05×4=$
$0.37×20=$
$2.12-0.08=$
$22.4÷8=$
$0.07×700=$
$1.35÷6=$

5-3.7=1.3
1.5×7=10.5
1.5÷15=0.1
320÷2=160
5.7+2.1=7.8
90×11=990
431-72=359
6.36÷6=1.06
1.73+6.3=8.03
3.2×50=160
190×3=570
7800÷60=130
0.96÷6=0.16
3.05-1.35=1.7
0.64×5=3.2
350×20=7000
2.8÷14=0.2
10.1×30=303
8.1÷3=2.7
0.35×200=70
7÷35=0.2
2.09+3.44=5.53
0.084÷10=0.0084
12.5×80=1000
2.05×4=8.2
0.37×20=7.4
2.12-0.08=2.04
22.4÷8=2.8
0.07×700=49
1.35÷6=0.225

二、计算下面各图形的高。
1.
2.

1. 126.75÷15=8.45(cm)
2. 3×4÷2×2÷5=2.4(cm)