分析:(1)0.85×201,運(yùn)用乘法分配律進(jìn)行簡算;
(2)0.5×4.85×8,運(yùn)用乘法交換律進(jìn)行簡算;
(3)2.5×48-48,將原式轉(zhuǎn)化為:2.5×4×12-48,然后運(yùn)用乘法結(jié)合律進(jìn)行簡算;
(4)2.7+4.29+2.71+6.3,運(yùn)用加法交換律和結(jié)合律進(jìn)行簡算;
(5)1.2×3.5+8.8×3.5,運(yùn)用乘法分配律進(jìn)行簡算.
解答:解:(1)0.85×201,
=0.85×200+0.85×1,
=170+0.85,
=170.85;
(2)0.5×4.85×8,
=0.5×8×4.85,
=4×4.85,
=19.4;
(3)2.5×48-48,
=(2.5×4)×12-48,
=10×12-48,
=120-48,
=72;
(4)2.7+4.29+2.71+6.3,
=(2.7+6.3)+(4.29+2.71).
=9+7,
=16;
(5)1.2×3.5+8.8×3.5,
=(1.2+8.8)×3.5,
=10×3.5,
=35.
點(diǎn)評(píng):此題考查的目的是理解掌握乘法、加法的運(yùn)算定律,并且能夠運(yùn)用這些運(yùn)算定律對(duì)小數(shù)四則混合運(yùn)算進(jìn)行簡便計(jì)算.