解:(1)7.65-0.65×6,
=7.65-3.9,
=3.75;
(2)9.43-1.68-4.32,
=9.43-(1.68+4.32),
=9.43-6,
=3.43;
(3)1.25×0.76×0.8,
=(1.25×0.8)×0.76,
=1×0.76,
=0.76;
(4)0.32×7.5-0.32×4.5,
=0.32×(7.5-4.5),
=0.32×3,
=0.96;
(5)3.8×10.1,
=3.8×(10+0.1),
=38+0.38,
=38.38;
(6)9.9÷[16.5-(1.7+3.8)],
=9.9÷[16.5-5.5],
=9.9÷11,
=0.9.
分析:(1)先算乘法,再算減法;
(2)運(yùn)用減法的性質(zhì)簡(jiǎn)算;
(3)運(yùn)用乘法交換律與結(jié)合律簡(jiǎn)算;
(4)運(yùn)用乘法分配律簡(jiǎn)算;
(5)把10.1看作10+0.1,運(yùn)用分配律簡(jiǎn)算;
(6)先算小括號(hào)內(nèi)的,再算中括號(hào)內(nèi)的,最后算括號(hào)外的.
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)算律簡(jiǎn)便計(jì)算.