题目内容
【题目】计算下面各题,能简算的要简算
10.1×7.8 0.9×12.56﹣2.56×0.9 10﹣3.8×0.4÷7.6 0.25×[(2.8+4.4)÷1.2]
【答案】78.78;9;9.8;1.5
【解析】
(1)10.1×7.8
=(10+0.1)×7.8
=10×7.8+0.1×7.8
=78+0.78
=78.78
(2)0.9×12.56﹣2.56×0.9
=(12.56﹣2.56)×0.9
=10×0.9
=9
(3)10﹣3.8×0.4÷7.6
=10﹣1.52÷7.6
=10﹣0.2
=9.8
(4)0.25×[(2.8+4.4)÷1.2]
=0.25×[7.2÷1.2]
=0.25×6
=1.5
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