一、口算。
$24÷50=$
$43×0.01=$
$1.6÷3.2=$
$0.15×30=$
$0.45+2.85=$
$0.07×7=$
$7÷5=$
$25−5.6=$
$4.8+6.2=$
$90−19=$
$360÷20=$
$56×101=$
$180÷5=$
$8.6×0.6=$
$9÷18=$
$3.1−2.5=$
$0.8+1.32=$
$0.78−0.6=$
$1.5−0.44=$
$3.1×0.7=$
$870+33=$
$2.46+3.59=$
$0.81−0.72=$
$0.1÷2=$
$24÷50=$
0.48
$43×0.01=$
0.43
$1.6÷3.2=$
0.5
$0.15×30=$
4.5
$0.45+2.85=$
3.3
$0.07×7=$
0.49
$7÷5=$
1.4
$25−5.6=$
19.4
$4.8+6.2=$
11
$90−19=$
71
$360÷20=$
18
$56×101=$
5656
$180÷5=$
36
$8.6×0.6=$
5.16
$9÷18=$
0.5
$3.1−2.5=$
0.6
$0.8+1.32=$
2.12
$0.78−0.6=$
0.18
$1.5−0.44=$
1.06
$3.1×0.7=$
2.17
$870+33=$
903
$2.46+3.59=$
6.05
$0.81−0.72=$
0.09
$0.1÷2=$
0.05
答案
一、0.48 0.43 0.5
4.5 3.3 0.49
1.4 19.4 11
71 18 5656
36 5.16 0.5
0.6 2.12 0.18
1.06 2.17 903
6.05 0.09 0.05
4.5 3.3 0.49
1.4 19.4 11
71 18 5656
36 5.16 0.5
0.6 2.12 0.18
1.06 2.17 903
6.05 0.09 0.05
二、解方程。
$430−x=374$
$x+23=42$
$305+x=781$
$x+5.6=12.3$
$x−1.5=2.61$
$4.93+x=8$
$430−x=374$
$x+23=42$
$305+x=781$
$x+5.6=12.3$
$x−1.5=2.61$
$4.93+x=8$
答案
1. $430 - x = 374$
解:$x = 430−374$
$x = 56$
2. $x + 23 = 42$
解:$x=42 - 23$
$x = 19$
3. $305 + x = 781$
解:$x = 781−305$
$x = 476$
4. $x + 5.6 = 12.3$
解:$x=12.3 - 5.6$
$x = 6.7$
5. $x−1.5 = 2.61$
解:$x = 2.61+1.5$
$x = 4.11$
6. $4.93 + x = 8$
解:$x = 8−4.93$
$x = 3.07$
解:$x = 430−374$
$x = 56$
2. $x + 23 = 42$
解:$x=42 - 23$
$x = 19$
3. $305 + x = 781$
解:$x = 781−305$
$x = 476$
4. $x + 5.6 = 12.3$
解:$x=12.3 - 5.6$
$x = 6.7$
5. $x−1.5 = 2.61$
解:$x = 2.61+1.5$
$x = 4.11$
6. $4.93 + x = 8$
解:$x = 8−4.93$
$x = 3.07$
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