问题 解答题
用简便方法计算.
4.35+8.6+15.65+1.4
19.32-5.56-3.44
37.6-(7.6+3.25)5.49+2.68-3.49
6.27+3.83+1.738.4+3.5-8.4+3.5.
答案

(1)4.35+8.6+15.65+1.4

=(4.35+15.65)+(8.6+1.4),

=20+10,

=30;

(2)19.32-5.56-3.44

=19.32-(5.56+3.44),

=19.32-9,

=10.32;

(3)37.6-(7.6+3.25)

=37.6-7.6-3.25,

=30-3.25,

=26.75;

(4)5.49+2.68-3.49

=5.49-3.49+2.68,

=2+2.68,

=4.68;

(5)6.27+3.83+1.73

=6.27+1.73+3.83,

=8+3.83,

=11.83;

(6)8.4+3.5-8.4+3.5

=8.4-8.4+(3.5+3.5),

=0+7,

=7.

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