题目内容

【题目】简算.

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】

试题分析:(1)、(7)、(8)、(9)、(10)、(11)、(17)、(20)、(21)、(22)、(23)、(24)根据乘法分配律进行简算;

(2)、(12)、(14)、(25)、(27)、(28)根据加法交换律和结合律进行简算;

(3)、(4)、(5)、(6)、(13)、(15)、(16)、(19)根据乘法交换律和结合律进行简算;

(18)根据连除的性质进行简算;

(26)、(29)根据连减的性质进行减法.

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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