| 直接写出得数. 7.2+2.8= | 8-2.5= | 0.3+0.6= | 0.32+0.8= | 2× = |
15× = | 1-0.52= | 1÷ = | + = | 16× = |
+0= | 2.5×4= | - = | 1- = | ×5= |
| 7.2+2.8=10, | 8-2.5=5.5, | 0.3+0.6=0.9, | 0.32+0.8=1.12, | 2× = , |
15× =5, | 1-0.52=0.48, | 1÷ = , | + = , | 16× =10, |
+0= , | 2.5×4=10, | - = , | 1- = , | ×5=1. |
分析:根据小数和分数的加减乘除的计算方法进行计算即可.
点评:口算时,要看清运算符号和数据,按照它们各自的计算方法进行计算,能简算的要简算.
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