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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:根据小数加减乘除的计算方法进行计算即可.
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.
点评:小数的口算,不但要注意运算符号和数据,还要注意小数点的位置,然后再进一步计算即可.
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