分析:(1)(5)運(yùn)用乘法分配律簡(jiǎn)算;
(2)根據(jù)減法的性質(zhì)簡(jiǎn)算;
(3)根據(jù)除法的性質(zhì)簡(jiǎn)算;
(4)先把32分解成8×4,再根據(jù)乘法結(jié)合律簡(jiǎn)算;
(6)先把101分解成100+1,再運(yùn)用乘法分配律簡(jiǎn)算.
解答:解:(1)189×101-189
=189×(101-1)
=189×100
=18900;
(2)386-186-25-75
=(386-186)-(25+75)
=200-100
=100;
(3)32000÷125÷8
=32000÷(125×8)
=32000÷1000
=32;
(4)125×32×25
=(125×8)×(4×25)
=1000×100
=100000;
(5)27×187-5×187-2×187
=(27-5-2)×187
=20×187
=3740;
(6)89×101
=89×(100+1)
=89×100+89×1
=8900+89
=8989.
點(diǎn)評(píng):此題是考查四則混合運(yùn)算,要仔細(xì)觀察算式的特點(diǎn),靈活運(yùn)用一些定律進(jìn)行簡(jiǎn)便計(jì)算.