1. 用竖式计算下面各题,并且验算。
$43.6 + 9.45 =$ $80.5 - 7.56 =$
$3.14×2.6 =$ $4.2÷0.12 =$
$43.6 + 9.45 =$ $80.5 - 7.56 =$
$3.14×2.6 =$ $4.2÷0.12 =$
答案:
43.6 + 9.45 = 53.05
43.6
+ 9.45
------
53.05
验算:53.05
- 43.6
------
9.45@@80.5 - 7.56 = 72.94
80.5
- 7.56
------
72.94
验算:72.94
+ 7.56
------
80.5@@3.14×2.6 = 8.164
3.14
× 2.6
------
1884
628
------
8.164
验算:2.6 ) 8.164
7 8
----
3 6
2 6
----
1 0 4
1 0 4
----
0@@4.2÷0.12 = 35
0.12 ) 4.20
3 6
----
60
60
----
0
验算:35
× 0.12
------
70
3 5
------
4.2
2. 计算下面各题。
$5.38 + 7.85 - 5.37$ $25.2÷12 + 29$
$(5.9 + 1.65)÷0.25$ $(1.7 - 0.8)×(2 - 1.5)$
$48÷2.4 - 2.5×8$ $24÷(2.4×25 - 12)$
$5.38 + 7.85 - 5.37$ $25.2÷12 + 29$
$(5.9 + 1.65)÷0.25$ $(1.7 - 0.8)×(2 - 1.5)$
$48÷2.4 - 2.5×8$ $24÷(2.4×25 - 12)$
答案:
5.38 + 7.85 - 5.37
= 13.23 - 5.37
= 7.86@@25.2÷12 + 29
= 2.1 + 29
= 31.1@@(5.9 + 1.65)÷0.25
= 7.55÷0.25
= 30.2@@(1.7 - 0.8)×(2 - 1.5)
= 0.9×0.5
= 0.45@@48÷2.4 - 2.5×8
= 20 - 20
= 0@@24÷(2.4×25 - 12)
= 24÷(60 - 12)
= 24÷48
= 0.5
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