2-2÷3-數(shù)學(xué)公式25×2.5×32數(shù)學(xué)公式×(數(shù)學(xué)公式+數(shù)學(xué)公式)+0.8
5.02-1.37-2.6320%+數(shù)學(xué)公式+80%-數(shù)學(xué)公式數(shù)學(xué)公式

解:(1)2-2÷3-
=2--,
=2-(+),
=2-1,
=1;

(2)25×2.5×32,
=25×2.5×4×4×2,
=(25×4)×(2.5×4)×2,
=100×10×2,
=1000×2,
=2000;

(3)×(+)+0.8,
=×+×+0.8,
=2++,
=2+(+),
=2+2,
=4;

(4)5.02-1.37-2.63,
=5.02-(1.37+2.63),
=5.02-4,
=1.02;

(5)20%++80%-,
=(20%+80%)+(-),
=1+0,
=1;

(6),
=××,
=×(),
=×1,
=
分析:(1)先算出除法,再運(yùn)用連續(xù)減去兩個(gè)數(shù)等于減去這兩個(gè)數(shù)的和簡(jiǎn)算;
(2)把32分解成4×4×2,然后運(yùn)用乘法結(jié)合律簡(jiǎn)算;
(3)先運(yùn)用乘法分配律簡(jiǎn)算,再運(yùn)用加法結(jié)合律簡(jiǎn)算;
(4)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;
(5)運(yùn)用加法結(jié)合律簡(jiǎn)算;
(6)先把除法變成乘法,再運(yùn)用乘法分配律簡(jiǎn)算.
點(diǎn)評(píng):本題主要考查了簡(jiǎn)便運(yùn)算的方法:運(yùn)算定律是常用的簡(jiǎn)便運(yùn)算的方法,要熟練掌握,靈活運(yùn)用.
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