1.25×32 0.56+3.48+0.44+6.52 2.8×(2.25+28.5÷1.5)
5.8×7.6+7.6×4.2 145.3-58.6-41.4 [(5.1-3.6)÷0.8-1]×0.09.
分析:(1)把32看作8×4,運用乘法結合律簡算;
(2)運用加法交換律與結合律簡算;
(3)先算括號內的除法,再算括號內的加法,最后算乘法;
(4)運用乘法分配律簡算;
(5)運用減法的性質簡算;
(6)先算小括號內的,再算中括號內的除法,然后算中括號內的減法,最后算乘法.
解答:解:(1)1.25×32,
=1.25×8×4,
=1.25×8×4,
=10×4,
=40;

(2)0.56+3.48+0.44+6.52,
=(0.56+0.44)+(3.48+6.52),
=1+10,
=11;

(3)2.8×(2.25+28.5÷1.5),
=2.8×(2.25+19),
=2.8×21.25,
=59.5;

(4)5.8×7.6+7.6×4.2,
=(5.8+4.2)×7.6,
=10×7.6,
=76;

(5)145.3-58.6-41.4,
=145.3-(58.6+41.4),
=145.3-100,
=45.3;

(6)[(5.1-3.6)÷0.8-1]×0.09,
=[1.5÷0.8-1]×0.09,
=[1.875-1]×0.09,
=0.875×0.09,
=0.07875.
點評:考查了四則混合運算,注意運算順序和運算法則,靈活運用所學的運算律簡便計算.
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