题目内容
【题目】脱式计算(能简算的要简算,并写出简算过程)
①6.8×101-68×0.1
②2.5×(2.9+2.9+5.8)
③5.8÷()
④
⑤3.25×-3.25×+2×325%
⑥
【答案】①680②29③ ④ ⑤13⑥
【解析】
①把原式化为68×10.1-68×0.1,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;
⑥先计算括号内的,再计算除法即可求解.
①6.8×101-68×0.1
=68×10.1-68×0.1
=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
=
④
=
=
⑤3.25×-3.25×+2×325%
= 3.25×-3.25×+2×3.25
=3.25×
=3.25×4
=13
⑥
=
=
=
=
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