题目内容
42.4+7.6= | 1.58+2.42= | 23.5+76.5÷0.25= | 7.8-5.6= |
1.25×4= | 34.6÷0.2×4= | 0.24÷0.3= | 7.8×0.5= |
1÷0.2-1×0.2= | 57÷5.7= | 8.1-0.05= | 0.2×0.5= |
分析:根据小数加减乘除的计算方法进行计算即可.
解答:解:
42.4+7.6=50, | 1.58+2.42=4, | 23.5+76.5÷0.25=329.5, | 7.8-5.6=2.2, |
1.25×4=5, | 34.6÷0.2×4=692, | 0.24÷0.3=0.8, | 7.8×0.5=3.9, |
1÷0.2-1×0.2=4.8, | 57÷5.7=10, | 8.1-0.05=8.05, | 0.2×0.5=0.1. |
点评:口算时,注意运算符号和数据,然后再进一步计算.
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