解:(1)45.36÷7.2-2.5×0.2,
=6.3-0.5,
=5.8;
(2)5.12-(4.65-4.88),
=5.12-4.65+4.88,
=(5.12+4.68)-4.65,
=10-4.65,
=5.35;
(3)2.7÷4+6.3×0.5,
=0.675+3.15,
=3.825;
(4)9.43×1.1,
=9.43×(1+0.1),
=9.43+0.943,
=14.198;
(5)0.25×12.5×3.2,
=0.25×12.5×0.8×4,
=(0.25×4)×(12.5×0.8),
=1×10,
=10;
(6)30.8×0.35+6.5×3.08,
=3.08×3.5+6.5×3.08,
=3.08×(3.5+6.5),
=3.08×10,
=30.8.
分析:(1)先算除法和乘法,再算減法;
(2)運(yùn)用減法的性質(zhì)和加法交換律與結(jié)合律簡算;
(3)先算除法和乘法,再算加法;
(4)把1.1看作1+0.1,運(yùn)用乘法分配律簡算;
(5)把3.2看作0.8×4,運(yùn)用乘法交換律與結(jié)合律簡算;
(6)原式變?yōu)?.08×3.5+6.5×3.08,運(yùn)用乘法分配律簡算.
點(diǎn)評(píng):此題考查了小數(shù)的四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律進(jìn)行簡便計(jì)算.