分析:(1)根據(jù)乘法分配律進(jìn)行計(jì)算;
(2)根據(jù)乘法結(jié)合律進(jìn)行計(jì)算;
(3)根據(jù)乘法分配律進(jìn)行計(jì)算;
(4)根據(jù)乘法交換律和結(jié)合律進(jìn)行計(jì)算;
(5)根據(jù)乘法分配律進(jìn)行計(jì)算;
(6)根據(jù)乘法分配律進(jìn)行計(jì)算.
解答:解:
(1)101×78,
=(100+1)×78,
=100×78+78,
=7800+78,
=7878;
(2)25×88,
=25×(4×22),
=(25×4)×22,
=100×22,
=2200;
(3)99×76+76,
=(99+1)×76,
=100×76,
=7600;
(4)5×38×4×5,
=(5×5×4)×38,
=100×38,
=3800;
(5)(25+20)×4,
=25×4+20×4,
=100+80,
=180;
(6)35×103-3×35,
=(103-3)×35,
=100×35,
=3500.
點(diǎn)評(píng):四則運(yùn)算,先弄清運(yùn)算順序,然后再進(jìn)一步計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算.