88845536 发表于 2017-10-15 12:01:19

浙教版五年级上册数学第1章小数的意义与加减法【8】小数加减法[2]作业本详细解答过程和答案

小数加减法详细解答过程和答案
用简便方法计算
1.75+0.43+3025
=(1.75+3.25)+0.43
=5+0.43
=5.43
3.4+2.7+6.6
=(3.4+6.6)+2.7
=10+2.7
=12.7
8.04-0.67-1.33
=8.04-(0.67+1.33)
=8.04-2
=6.04
23-5.61-4.39
=23-(5.61+4.39)
=23-10
=13
3.84+5.29+4.71
=3.84+(5.29+4.71)
=3.84+10
=13.84
6.7+3.08+6.92
=6.7+(3.08+6.92)
=6.7+10
=16.7
15.62-0.35-5.62
=(15.62-5.62)-0.35
=10-0.35
=9.65
40.7-3.27-1.73
=40.7-(3.27+1.73)
=40.7-5
=35.7
9.37-(4.6+1.37)
=9.37-4.6-1.37
=(9.37-1.37)-4.6
=8-4.6
=3.4
11.62-(5.62+3.1)
=(11.62-5.62)-3.1
=6-3.1
=2.9
6.91-(3.91+0.48)
=(6.91-3.91)-0.48
=3-0.48
=2.52
9.83-(4.7+2.83)
=(9.83-2.83)-4.7
=7-4.7
=2.3
11.9+5.36+4.64+8.1
=(11.9+8.1)+(5.36+4.64)
=20+10
=30
13.4+0.57+1.43+1.6
=(13.4+1.6)+(0.57+1.43)
=15+2
=17
18.4-0.7-1.2-1.1
=18.4-(0.7+1.2+1.1)
=18.4-3
=15.4
15-7.8-1.15-1.05
=15-(7.8+1.15+1.05)
=15-10
=5
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