题目内容

【题目】脱式计算(能简算的要简算,并写出简算过程)

6.8×10168×0.1

2.5×2.9+2.9+5.8

5.8÷

3.25×3.25×+2×325%

【答案】68029 13

【解析】

①把原式化为68×10.168×0.1,再利用乘法分配律即可求解;

②把原式化为2.5×2×5.8即可计算;

③先计算5.8÷5.8即可求解;

④直接通分即可计算;

⑤利用乘法分配律即可求解;

先计算括号内的,再计算除法即可求解.

①6.8×10168×0.1

=68×10.168×0.1

=68×(10.1-0.1)

=68×10

=680

②2.5×2.9+2.9+5.8

= 2.5×2×5.8

=5×5.8

=29

③5.8÷

= 5.8÷

= 5.8

=

=

=

⑤3.25×3.25×+2×325%

= 3.25×3.25×+2×3.25

=3.25×

=3.25×4

=13

=

=

=

=

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