32000÷125           10.7+5.38+4.62    54×45+45+45×45      
125×(25×32 )   32.63-(7.89-2.09)[3920-(56+44×14)]÷14.

解:(1)32000÷125
=32×1000÷125,
=32×(1000÷125),
=32×8,
=256;

(2)10.7+5.38+4.62
=10.7+(5.38+4.62),
=10.7+10,
=20.7;

(3)54×45+45+45×45
=(54+1+45)×45,
=100×45,
=4500;

(4)125×(25×32 )
=125×25×8×4,
=(125×8)×(25×4),
=1000×100,
=100000;

(5)32.63-(7.89-2.09)
=32.63-5.8,
=26.83;

(6)[3920-(56+44×14)]÷14
=3920÷14-(56+44×14)÷14,
=280-56÷14-44×14÷14,
=280-4-44,
=232.
分析:算式(1)可將32000拆分為32×1000后根據(jù)乘法結(jié)合律進(jìn)行計(jì)算;
算式(2)可根據(jù)加法結(jié)合律計(jì)算;
算式(3)可根據(jù)乘法分配律計(jì)算;
算式(4)將32拆分為8×4后根據(jù)乘法交換律及結(jié)合律計(jì)算;
算式(5)根據(jù)四則混合運(yùn)算的運(yùn)算順序計(jì)算即可;
算式(6)根據(jù)乘法分配律計(jì)算即可.
點(diǎn)評(píng):完成本題要細(xì)心分析式中數(shù)據(jù)的特點(diǎn)及內(nèi)在聯(lián)系,然后選擇合適的方法進(jìn)行計(jì)算.
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