【題目】簡算.
76×101﹣76 58+39+42+61 4×39×2.5 (25×15)×4 25×42×4
125×32 3.6×97+3.6×3 4×25+16×25 36×45+36×56﹣36 68×102
64×15﹣14×15 167+289+33 25×64×125 378+525+75 0.4×25×1.6×25
5×289×2 79×2.5+2.5 4.08÷1.25÷0.8 125×88 87×9.9
101×0.82﹣0.82 25×97+25×3 (125+17)×8 66×93+93×33+93 ++=
1﹣﹣= ++= +﹣= 1﹣﹣=
【答案】7600;200;390;1500;4200;4000;360;500;3600;6935;750;489;200000;978;400;2890;200;4.08;11000;861.3;82;2500;1136;9300;1;;1;;.
【解析】
試題分析:(1)、(7)、(8)、(9)、(10)、(11)、(17)、(20)、(21)、(22)、(23)、(24)根據(jù)乘法分配律進行簡算;
(2)、(12)、(14)、(25)、(27)、(28)根據(jù)加法交換律和結(jié)合律進行簡算;
(3)、(4)、(5)、(6)、(13)、(15)、(16)、(19)根據(jù)乘法交換律和結(jié)合律進行簡算;
(18)根據(jù)連除的性質(zhì)進行簡算;
(26)、(29)根據(jù)連減的性質(zhì)進行減法.
解:(1)76×101﹣76,
=76×(100﹣1),
=76×100,
=7600;
(2)58+39+42+61,
=(58+42)+(39+61),
=100+100,
=200;
(3)4×39×2.5,
=39×(4×2.5),
=39×10,
=390;
(4)(25×15)×4,
=(25×4)×15,
=100×15,
=1500;
(5)25×42×4,
=(25×4)×42,
=100×42,
=4200;
(6)125×32,
=125×(4×8),
=(125×8)×4,
=1000×4,
=4000;
(7)3.6×97+3.6×3,
=3.6×(97+3),
=3.6×100,
=360;
(8)4×25+16×25,
=(4+16)×25,
=20×25,
=500;
(9)36×45+36×56﹣36,
=36×(45+56﹣1),
=36×100,
=3600;
(10)68×102,
=68×(100+2),
=68×100+68×2,
=6800+136,
=6935;
(11)64×15﹣14×15,
=(64﹣14)×15,
=50×15,
=750;
(12)167+289+33,
=(167+33)+289,
=200+289,
=489;
(13)25×64×125,
=25×(8×8)×125,
=(25×8)×(8×125),
=200×1000,
=200000;
(14)378+525+75,
=378+(525+75),
=378+600,
=978;
(15)0.4×25×1.6×25,
=0.4×25×(4×0.4)×25,
=(0.4×25)×(4×25)×0.4,
=10×100×0.4,
=1000×0.4,
=400;
(16)5×289×2,
=289×(5×2),
=289×10,
=2890;
(17)79×2.5+2.5,
=(79+1)×2.5,
=80×2.5,
=200;
(18)4.08÷1.25÷0.8,
=4.08÷(1.25×0.8),
=4.08÷1,
=4.08;
(19)125×88,
=125×(8×11),
=(125×8)×11,
=1000×11,
=11000;
(20)87×9.9,
=87×(10﹣0.1),
=87×10﹣87×0.1,
=870﹣8.7,
=861.3;
(21)101×0.82﹣0.82,
=(100﹣1)×0.82,
=100×0.82,
=82;
(22)25×97+25×3,
=25×(97+3),
=25×100,
=2500;
(23)(125+17)×8,
=125×8+17×8,
=1000+136,
=1136;
(24)66×93+93×33+93,
=(66+33+1)×93,
=100×93,
=9300;
(25)++,
=(+)+,
=1+,
=1;
(26)1﹣﹣,
=1﹣(+),
=1﹣,
=;
(27)++,
=(+)+,
=1+,
=1;
(28)+﹣,
=(﹣)+,
=+,
=;
(29)1﹣﹣,
=1﹣(+),
=1﹣,
=.
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