分析:①47×21+79×47,運(yùn)用乘法分配律簡(jiǎn)算;
②449×101,運(yùn)用乘法分配律簡(jiǎn)算;
③134×25-25×33-25,運(yùn)用乘法分配律簡(jiǎn)算;
④(125+40)×8,運(yùn)用乘法分配律簡(jiǎn)算;
⑤132×99,轉(zhuǎn)化為:132×(100-1),再運(yùn)用乘法分配律簡(jiǎn)算;
⑥125×88,轉(zhuǎn)化為:125×8×11,運(yùn)用乘法結(jié)合律簡(jiǎn)算.
解答:解:①47×21+79×47
=47×(21+79)
=47×100
=4700;
②449×101
=449×100+449×1
=44900+449
=45349;
③134×25-25×33-25
=(134-1-33)×25
=100×25
=2500;
④(125+40)×8
=125×8+40×8
=1000+320
=1320;
⑤132×99
=132×(100-1)
=132×100-132×1
=13200-132
=13068;
⑥125×88
=125×8×11
=1000×11
=11000.
點(diǎn)評(píng):此題考查的目的是理解掌握乘法的運(yùn)算定律,并且能夠靈活運(yùn)用乘法的運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.