解:(1)3.72+5.3+7.28+3.7,
=(3.72+7.28)+(5.3+3.7),
=11+9,
=20;
(2)7000÷125÷8,
=7000÷(125×8),
=7000÷1000,
=7;
(3)1600-600÷75+25,
=1600-8+25,
=1592+25,
=1617;
(4)35×125×16,
=(35×2)×(125×8),
=70×1000,
=70000;
(5)78×63-78+38×78,
=78×(63-1+38),
=78×100,
=7800;
(6)(480+120÷15)×50,
=(480+8)×50,
=480×50+8×50,
=24000+400,
=24400.
分析:(1)運(yùn)用加法交換律和加法結(jié)合律解答;
(2)運(yùn)用除法的性質(zhì)解答;
(3)依據(jù)四則運(yùn)算計(jì)算方法,先算第二級(jí)運(yùn)算,再算第一級(jí)運(yùn)算,如果只含有同一級(jí)運(yùn)算,按照從左到右順序計(jì)算,有括號(hào)先算括號(hào)里面的解答;
(4)化16=8×2,再運(yùn)用乘法交換律,以及乘法結(jié)合律解答;
(5)(6)運(yùn)用乘法分配律解答.
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡(jiǎn)便方法計(jì)算.