1÷(1-0.99)= 0.2×[(1-0.6)÷2.5]= 0.25×1.25×32=
13.5-1.96-1.04= 9.8×0.35+0.35×0.2=
分析:(1)(2)依據(jù)小數(shù)加、減、乘、除法計(jì)算方法解答,
(3)把32寫成8×4,運(yùn)用乘法交換律、結(jié)合律解答,
(4)依據(jù)從一個(gè)數(shù)減去兩個(gè)數(shù)等于減去這兩個(gè)數(shù)的和,
(5)運(yùn)用加法分配律解答,
解答:解:(1)1÷(1-0.99),
=1÷0.01,
=100;

(2)0.2×[(1-0.6)÷2.5],
=0.2×[0.4÷2.5],
=0.2×0.16,
=0.032;

(3)0.25×1.25×32
=0.25×1.25×8×4,
=(0.25×4)×(1.25×8),
=1×10,
=10;

(4)13.5-1.96-1.04,
=13.5-(1.96+1.04),
=13.5-3,
=10.5;

(5)9.8×0.35+0.35×0.2,
=0.35×(9.8+0.2),
=0.35×10,
=3.5;
點(diǎn)評(píng):本題主要考查學(xué)生運(yùn)用小數(shù)四則運(yùn)算計(jì)算方法,以及運(yùn)用簡(jiǎn)便算法解決問題的能力.
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