用简便方法计算下面各题. 178+24+22+76 956-159-41 75×99+75 88×125 4000÷125÷8 45×101 17×23-23×7.
问题描述:
用简便方法计算下面各题.
178+24+22+76 | 956-159-41 | 75×99+75 | 88×125 |
4000÷125÷8 | 45×101 | 17×23-23×7. |
答
(1)178+24+22+76
=(178+22)+(24+76)
=200+100
=300
(2)956-159-41
=956-(159+41)
=956-200
=756
(3)75×99+75
=75×(99+1)
=75×100
=7500
(4)88×125
=11×(8×125)
=11×1000
=11000
(5)4000÷125÷8
=4000÷(125×8)
=4000÷1000
=4
(6)45×101
=45×(100+1)
=45×100+45
=4545
(7)17×23-23×7
=23×(17-7)
=23×10
=230