分析:(1)運(yùn)用減法的性質(zhì)進(jìn)行簡(jiǎn)算,
(2)根據(jù)四則混合運(yùn)算的運(yùn)算順序進(jìn)行計(jì)算,
(3)運(yùn)用加法的交換律、結(jié)合律進(jìn)行簡(jiǎn)算,
(4)運(yùn)用乘法的交換律、結(jié)合律進(jìn)行簡(jiǎn)算,
(5)運(yùn)用乘法的分配律進(jìn)行簡(jiǎn)算,
(6)根據(jù)四則混合運(yùn)算的運(yùn)算順序進(jìn)行計(jì)算,先算除法,再算加法.
解答:解:(1)415-176-24,
=415-(176+24),
=415-200,
=215;
(2)15×27-3000÷25,
=405-120,
=285;
(3)8.29+3.7+0.71+6.3,
=(8.29+0.71)+(3.7+6.3),
=9+10,
=19;
(4)125×89×8,
=(125×8)×89,
=1000×89,
=89000;
(5)428×78+572×78,
=(428+572)×78,
=1000×78,
=78000;
(6)5625÷75+25,
=75+25,
=100.
點(diǎn)評(píng):考查了四則混合運(yùn)算的運(yùn)算順序,分析算式特點(diǎn),靈活運(yùn)用運(yùn)算定律進(jìn)行簡(jiǎn)算.