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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