3.29-(1數(shù)學(xué)公式+1.29)
2700-780÷26×34
1.25×32×2.5
數(shù)學(xué)公式×45-數(shù)學(xué)公式÷數(shù)學(xué)公式

解:(1)3.29-(1+1.29),
=3.29-1.29-1
=2-1,
=;

(2)2700-780÷26×34,
=2700-30×34,
=2700-1020,
=1680;

(3)1.25×32×2.5,
=1.25×8×4×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;

(4)×45-÷,
=×45-×45,
=(-)×45,
=0×45,
=0.
分析:(1)根據(jù)減去兩個(gè)數(shù)的和等于連續(xù)減去兩個(gè)數(shù)簡(jiǎn)算;
(2)先算除法,再算除法,最后算減法;
(3)先把32分解成8×4,再使用乘法結(jié)合律簡(jiǎn)算;
(4)先把除法變成乘法,再運(yùn)用乘法分配律簡(jiǎn)算.
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡(jiǎn)便方法計(jì)算.
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