考點(diǎn):整數(shù)四則混合運(yùn)算,運(yùn)算定律與簡便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡算
分析:(1)運(yùn)用整數(shù)的四則混合運(yùn)算的順序來計(jì)算.
(2)根據(jù)連續(xù)除以兩個數(shù)等于除以這兩個數(shù)的積簡化運(yùn)算.
(3)根據(jù)連續(xù)減去兩個數(shù)等于減去這兩個數(shù)的和來簡化運(yùn)算.
(4)運(yùn)用加法交換律及加法結(jié)合律來簡化運(yùn)算.
(5)把3600化為36×100先用100÷25再與36相乘來簡化運(yùn)算.
解答:
解:(1)238×(62-22)÷17
=238×40÷17
=9520÷17
=560
(2)6800÷125÷8
=6800÷(125×8)
=6800÷1000
=6.8
(3)43.08-14.9-15.1
=43.08-(14.9+15.1)
=43.08-20
=23.08
(4)6.792+8.827+(2.173+3.208)
=(6.792+3.208)+(8.827+2.173)
=10+11
=21
(5)3600÷25
=36×100÷25
=36×(100÷25)
=36×4
=144
點(diǎn)評:本題主要考查學(xué)生靈活運(yùn)用運(yùn)用整數(shù)的四則混合運(yùn)算的順序來計(jì)算.注意運(yùn)用減法及除法的性質(zhì)來簡化運(yùn)算,能拆數(shù)的可適當(dāng)拆分.