题目内容

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+1.73 8.4+3.5-8.4+3.5.
分析:(1)(6)可根据加法交换律及结合律计算;
(2)可根据一个数减两个数,等于用这个数减去这两个数的和的减法性质计算;
(3)可根据一个数减两个数的和,等于用这个数分别减去这两个数的减法性质计算;
(4)(5)可根据加法交换律计算.
解答:解:(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.
点评:本题考查了学生运用运算定律完成小数加减法题目的能力.
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