类型三:(提示把102看作100+2;81看作80+1,再用乘法分配律) 78×102 69×102 56×101 52×102 125×81 25×41 75×41 76×101 62×102 105×81.
(1)78×102
=78×(100+2)
=78×100+78×2
=7800+156
=7956
(2)69×102
=69×(100+2)
=69×100+69×2
=6900+136
=7036
(3)56×101
=56×(100+1)
=56×100+56
=5600+56
=5656
(4)52×102
=52×(100+2)
=52×100+2×52
=5300+104
=5404
(5)125×81
=125×(80+1)
=125×80+125
=10000+125
=10125
(6)25×41
=25×(40+1)
=25×40+25
=1000+25
=1025
(7)75×41
=75×(40+1)
=75×40+75
=3000+75
=3075
(8)76×101
=76×(100+1)
=76×100+76
=7600+76
=7676
(9)62×102
=62×(100+2)
=62×100+62×2
=6200+124
=6324
(10)105×81
=(100+5)×81
=100×81+5×81
=8100+405
=8505
=78×(100+2)
=78×100+78×2
=7800+156
=7956
(2)69×102
=69×(100+2)
=69×100+69×2
=6900+136
=7036
(3)56×101
=56×(100+1)
=56×100+56
=5600+56
=5656
(4)52×102
=52×(100+2)
=52×100+2×52
=5300+104
=5404
(5)125×81
=125×(80+1)
=125×80+125
=10000+125
=10125
(6)25×41
=25×(40+1)
=25×40+25
=1000+25
=1025
(7)75×41
=75×(40+1)
=75×40+75
=3000+75
=3075
(8)76×101
=76×(100+1)
=76×100+76
=7600+76
=7676
(9)62×102
=62×(100+2)
=62×100+62×2
=6200+124
=6324
(10)105×81
=(100+5)×81
=100×81+5×81
=8100+405
=8505
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第1个回答 2020-03-11
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