题目内容
怎样算简便就怎样算.
(1)4.32+5.43+6.68 | (2)15.17-6.8-3.2 | (3)34.82-(4.82+15.2) |
(4)15.27+4.72-5.28 | (5)4.02-3.5+0.98 | (6)5.8-4.5+5.8-4.5. |
分析:(1)(5)可根据加法交换律进行计算;
(2)(6)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)按从左到右的顺序计算即可;
(5)可根据加法交换律计算.
(2)(6)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)按从左到右的顺序计算即可;
(5)可根据加法交换律计算.
解答:解:(1)4.32+5.43+6.68
=4.32+6.68+5.43,
=11+5.43,
=16.43;
(2)15.17-6.8-3.2
=15.17-(6.8+3.2),
=15.17-10,
=5.17;
(3)34.82-(4.82+15.2)
=34.82-4.82-15.2,
=30-15.2,
=14.8;
(4)15.27+4.72-5.28
=19.99-5.28,
=14.71;
(5)4.02-3.5+0.98
=4.02+0.98-3.5,
=5-3.5,
=1.5;
(6)5.8-4.5+5.8-4.5
=5.8+5.8-(4.5+4.5),
=11.6-9,
=2.6.
=4.32+6.68+5.43,
=11+5.43,
=16.43;
(2)15.17-6.8-3.2
=15.17-(6.8+3.2),
=15.17-10,
=5.17;
(3)34.82-(4.82+15.2)
=34.82-4.82-15.2,
=30-15.2,
=14.8;
(4)15.27+4.72-5.28
=19.99-5.28,
=14.71;
(5)4.02-3.5+0.98
=4.02+0.98-3.5,
=5-3.5,
=1.5;
(6)5.8-4.5+5.8-4.5
=5.8+5.8-(4.5+4.5),
=11.6-9,
=2.6.
点评:完成本题要注意分析式中数据的特点,然后运用合适的方法进行计算.
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