計(jì)算下面各題:(能簡算的要簡算)
6.7+25+3.3+75
103×12 14.85-(4.85+2.5) 15×99+15
(125+25)×8 2000÷125÷8 300-125+30×5 432÷12÷(57-51)
704-(53-18)×12 458-75×4+132 (459-27×5)÷36 (200+350)÷11×38.
分析:(1)運(yùn)用加法結(jié)合律和交換律解答,
(2)(4)(5)運(yùn)用乘法分配律解答,
(3)依據(jù)減法性質(zhì)解答,
(6)依據(jù)除法性質(zhì)解答,
(7)(8)(9)(10)(11)(12)依據(jù)四則運(yùn)算計(jì)算方法解答.
解答:解:(1)6.7+25+3.3+75,
=(6.7+3.3)+(25+75),
=10+100,
=110;

(2)103×12,
=(100+3)×12,
=100×12+3×12,
=1200+36,
=1236;

(3)14.85-(4.85+2.5),
=14.85-4.85-2.5,
=100-2.5,
=7.5;

(4)15×99+15,
=15×(99+1),
=15×100,
=1500;

(5)(125+25)×8,
=125×8+25×8,
=1000+200,
=1200;

(6)2000÷125÷8,
=2000÷(125×8),
=2000÷1000,
=2;

(7)300-125+30×5,
=300-125+150,
=175+150,
=325;

(8)432÷12÷(57-51),
=432÷12÷6,
=36÷6,
=6;

(9)704-(53-18)×12,
=704-35×12,
=704-420,
=284;

(10)458-75×4+132,
=458-300+132,
=158+132,
=290;

(11)(459-27×5)÷36,
=(459-135)÷36,
=324÷36,
=9;

(12)(200+350)÷11×38,
=550÷11×38,
=50×38,
=1900.
點(diǎn)評:本題主要考查學(xué)生依據(jù)四則運(yùn)算計(jì)算方法,依據(jù)正確選擇并運(yùn)用簡便算法解決問題的能力.
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