2.5×5= |
10+0.4= |
2.5×0.4= |
7.1×0.2= |
1÷0.1= |
3.6÷0.4= |
0.2×3.1= |
4.4-1.1= |
10+3.4= |
1-0.87= |
6.3×2= |
1.25×80= |
0.2×0.3= |
4.8÷1.2= |
2.5×0.4= |
8×12.5= |
7÷3.5= |
36÷0.4= |
分析:根據(jù)小數(shù)加減乘除的計算方法進行計算即可.
解答:解:
2.5×5=12.5, |
10+0.4=10.4, |
2.5×0.4=1, |
7.1×0.2=1.42, |
1÷0.1=10, |
3.6÷0.4=9, |
0.2×3.1=0.62, |
4.4-1.1=3.3, |
10+3.4=13.4, |
1-0.87=0.13, |
6.3×2=12.6, |
1.25×80=100, |
0.2×0.3=0.06, |
4.8÷1.2=4, |
2.5×0.4=1, |
8×12.5=100, |
7÷3.5=2, |
36÷0.4=90. |
點評:小數(shù)的口算,不但要注意運算符號和數(shù)據(jù),還要注意小數(shù)點的位置,然后再進一步計算即可.
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12÷0.5= | 5.2×0.4= | 12.2÷0.2= | 5.6÷100= |
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