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用简便方法计算.201×9999×78+78101×84-84125×8845×35+65×35143×25-43×25320×25×125854-274-126165+143+235+157
题目详情
用简便方法计算.
201×99 | 99×78+78 | 101×84-84 | 125×88 |
45×35+65×35 | 143×25-43×25 | 320×25×125 | 854-274-126 |
165+143+235+157 | 256×17-56×17 |
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答案和解析
(1)201×99
=201×(100-1)
=201×100-201×1
=20100-201
=19899;
(2)99×78+78
=(99+1)×78
=100×78
=7800;
(3)101×84-84
=(101-1)×84
=100×84
=8400;
(4)125×88
=125×(80+8)
=125×80+125×8
=10000+1000
=11000;
(5)45×35+65×35
=(45+65)×35
=110×35
=3850;
(6)143×25-43×25
=(143-43)×25
=100×25
=2500;
(7)320×25×125
=(40×8)×25×125
=(40×25)×(8×125)
=1000×1000
=1000000;
(8)854-274-126
=854-(274+126)
=854-400
=454;
(9)165+143+235+157
=(165+235)+(143+157)
=400+300
=700;
(10)256×17-56×17
=(256-56)×17
=200×17
=3400.
=201×(100-1)
=201×100-201×1
=20100-201
=19899;
(2)99×78+78
=(99+1)×78
=100×78
=7800;
(3)101×84-84
=(101-1)×84
=100×84
=8400;
(4)125×88
=125×(80+8)
=125×80+125×8
=10000+1000
=11000;
(5)45×35+65×35
=(45+65)×35
=110×35
=3850;
(6)143×25-43×25
=(143-43)×25
=100×25
=2500;
(7)320×25×125
=(40×8)×25×125
=(40×25)×(8×125)
=1000×1000
=1000000;
(8)854-274-126
=854-(274+126)
=854-400
=454;
(9)165+143+235+157
=(165+235)+(143+157)
=400+300
=700;
(10)256×17-56×17
=(256-56)×17
=200×17
=3400.
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