题目内容

【题目】用简便方法计算。(本题12分)

2.3+2.37+2.7

6.85+0.26.85+0.2

51.69(11.69+10.15)

0.35+2.45+1.65+4.55.

【答案】(1)2.3+2.37+2.7=7.37

(2)6.85+0.26.85+0.2=0.4

(3)51.69(11.69+10.15)=29.85

(4)0.35+2.45+1.65+4.55=9

【解析】

试题分析:(1)(2)(4)根据加法交换律和结合律简算即可.

(3)根据减法的性质简算即可.

解:(1)2.3+2.37+2.7

=2.3+2.7+2.37

=5+2.37

=7.37

(2)6.85+0.26.85+0.2

=(6.856.85)+(0.2+0.2)

=0+0.4

=0.4

(3)51.69(11.69+10.15)

=51.6911.6910.15

=4010.15

=29.85

(4)0.35+2.45+1.65+4.55

=(0.35+1.65)+(2.45+4.55)

=2+7

=9

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