题目内容

【题目】脱式计算

①0.125×3.2×0.5

②8.25+56÷32﹣1.25

③5.42×7.6+3.4×5.42﹣5.42

④2.5×(6.2﹣2.6)×0.4

⑤15.6÷[(20.75﹣4.5)×0.4]

【答案】1.2;8.75;54.2;3.6;2.4.

【解析】

试题分析:①把3.2分解成8×0.4再根据乘法结合律进行计算;

②先算除法,再多左到右依次进行计算;

③根据乘法分配律进行计算;

④先算括号里面的,再根据乘法交换律和结合律进行计算;

⑤先算小括号里面的,再算中括号里面的,最后算括号外面的.

解答:解:①0.125×3.2×0.5

=0.125×8×0.4×0.5

=(0.125×8)×(0.4×0.5)

=1×0.2

=0.2;

②8.25+56÷32﹣1.25

=8.25+1.75﹣1.25

=10﹣1.25

=8.75;

③5.42×7.6+3.4×5.42﹣5.42

=5.42×(7.6+3.4﹣1)

=5.42×10

=54.2;

④2.5×(6.2﹣2.6)×0.4

=2.5×3.6×0.4

=2.5×0.4×3.6

=1×3.6

=3.6;

⑤15.6÷[(20.75﹣4.5)×0.4]

=15.6÷[16.25×0.4]

=15.6÷6.5

=2.4.

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