5-2數(shù)學(xué)公式+數(shù)學(xué)公式=(12.5+數(shù)學(xué)公式)×8=19-3數(shù)學(xué)公式-4數(shù)學(xué)公式=8+0.1÷0.1-8=
21-2.897= 0.25×0.12= 3.6÷25%×4=數(shù)學(xué)公式=

解:(1)5-2+,
=2,
=3;

(2)(12.5+)×8,
=12.5×8+×8,
=100+6,
=106;

(3)19-3-4,
=19-(3+4),
=19-8,
=11;

(4)8+0.1÷0.1-8,
=8+1-8,
=1;

(5)21-2.897,
=21-3+0.103,
=18+0.103,
=18.103;

(6)0.25×0.12,
=0.25×(4×0.03),
=(0.25×4)×0.03,
=1×0.03,
=0.03;

(7)3.6÷25%×4,
=14.4×4,
=57.6;

(8),
=÷,
=
分析:(1)按照從左到右的順序計(jì)算;
(2)運(yùn)用乘法分配律簡(jiǎn)算;
(3)根據(jù)連續(xù)減去兩個(gè)數(shù)等于減去這兩個(gè)數(shù)的和簡(jiǎn)算;
(4)先算除法,再算加法,最后算減法;
(5)先把減2.897看成減3再加0.103簡(jiǎn)算;
(6)先把0.12分解成4×0.03,再運(yùn)用乘法結(jié)合律簡(jiǎn)算;
(7)先算除法,再算乘法;
(8)先算加法,再算除法;
點(diǎn)評(píng):此題是考查四則混合運(yùn)算,要仔細(xì)觀察算式的特點(diǎn),靈活運(yùn)用一些定律進(jìn)行簡(jiǎn)便計(jì)算.
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