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计算.6.9+4.8+3.10.456+6.22+3.7815.89+(6.75-5.89)4.02+5.4+0.985.17-1.8-3.213.75-(3.75+6.48)3.68+7.56-2.687.85+2.34-0.85+4.6635.6-1.8-15.6-7.2

题目详情
计算.
6.9+4.8+3.1       
0.456+6.22+3.78      15.89+(6.75-5.89)
4.02+5.4+0.98        5.17-1.8-3.2      13.75-(3.75+6.48)
3.68+7.56-2.68    7.85+2.34-0.85+4.66  35.6-1.8-15.6-7.2
▼优质解答
答案和解析
(1)6.9+4.8+3.1
=(6.9+3.1)+4.8
=10+4.8
=14.8

(2)0.456+6.22+3.78
=0.456+(6.22+3.78)
=0.456+10
=10.456

(3)15.89+(6.75-5.89)
=15.89-5.89+6.75
=10+6.75
=16.75

(4)4.02+5.4+0.98
=(4.02+0.98)+5.4
=5+5.4
=10.4

(5)5.17-1.8-3.2
=5.17-(1.8+3.2)
=5.17-5
=0.17
 
(6)13.75-(3.75+6.48)
=13.75-3.75-6.48
=10-6.48
=3.52

(7)3.68+7.56-2.68   
=(3.68-2.68)+7.56
=1+7.56
=8.56

(8)7.85+2.34-0.85+4.66 
=(7.85-0.85)+(2.34+4.66)
=7+7
=14

(9)35.6-1.8-15.6-7.2
=(35.6-15.6)-(1.8+7.2)
=20-9
=11