1.在横线上填上合适的数,在○中填相应的运算符号。
(1)23X99 (2)68X99
=___○___○___ =___○___○___
=___ =___
(3)48X999 (4)75X998
=___○___○___ =___○___○___○__
(5)63X101 (6)45X102
=___○___○___ =___○___○___○___
=___ =___
2.简便计算(要用综合)
(1)4.6X7+4.6X3 (2)250X36 (3)124X76-76X24
4.比一比,算一算
(1)808X125
=101X(8X125)
=
(2)808X125
=(800+8)X125
=
(3)2.5X32
=2.5X___○___
=
(4)2.5X99
=2.5X___○___
=
(5)125X24
=125○___○___
=
(6)25X96
=25X100○___X___
=
要求答案正确,答案齐全,写答案的时候标上题目编号
ï¼1ï¼23X99
=23X100-23
=2277
(2)68X99
=68X100-68
=6732
(3)48X999
=48X1000-48
4)75X998
=75X1000-75-75
5)63X101
=63X100+63
(6)45X102
=45X100+45+45
2.ç®ä¾¿è®¡ç®
(1)4.6X7+4.6X3
=4.6Xï¼7+3ï¼
=4.6X10
=46
(2)250X36
=250X4X9
=1000X9
=9000
3)124X76-76X24
=ï¼124-24ï¼X76
=100X76
=7600
4.æ¯ä¸æ¯,ç®ä¸ç®
1)808X125
=100X(8X125)
= 100X1000
=100000
2)808X125
=(800+8)X125
= 800X125+8X125
=100000+1000
=101000
(3)2.5X32
=2.5X4X8
=10X8
=80
(4)2.5X99
=2.5X100-2.5
=250-2.5
=247.5
(5)125X24
=125X8X3
=1000X3
=3000
6)25X96
=25X100-25X4
=2500-100
=2400
=23X100-23
=2277
(2)68X99
=68X100-68
=6732
(3)48X999
=48X1000-48
4)75X998
=75X1000-75-75
5)63X101
=63X100+63
(6)45X102
=45X100+45+45
2.ç®ä¾¿è®¡ç®
(1)4.6X7+4.6X3
=4.6Xï¼7+3ï¼
=4.6X10
=46
(2)250X36
=250X4X9
=1000X9
=9000
3)124X76-76X24
=ï¼124-24ï¼X76
=100X76
=7600
4.æ¯ä¸æ¯,ç®ä¸ç®
1)808X125
=100X(8X125)
= 100X1000
=100000
2)808X125
=(800+8)X125
= 800X125+8X125
=100000+1000
=101000
(3)2.5X32
=2.5X4X8
=10X8
=80
(4)2.5X99
=2.5X100-2.5
=250-2.5
=247.5
(5)125X24
=125X8X3
=1000X3
=3000
6)25X96
=25X100-25X4
=2500-100
=2400
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第1个回答 2013-09-25
同意凡夫的,都采用简易计算