题目内容

【题目】递等式计算:

(7.5+2.5)×0.25

710﹣18×4

5.4÷18+12

×

2.25×1.8+12.5×0.18

[1﹣( + )]×36.

【答案】解:①(7.5+2.5)×0.25,
=10×0.25,
=2.5;
②710﹣18×4,
=710﹣72,
=638;
③5.4÷18+12,
=0.3+12,
=12.3;
④2÷ ×
= ×
=
⑤2.25×1.8+12.5×0.18,
=(22.5+12.5)×0.18,
=35×0.18,
=6.3;
⑥[1﹣( )]×36,
=(1﹣ )×36,
= ×36,
=6.
【解析】按照整数、分数、小数的四则混合运算的顺序计算,有括号的,先算括号里面的,没有括号时,先算乘除法,再算加减法,能简算的要简算.

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