13.5-2.99-3.9的简便运算?
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展开全部
13.5-2.99-3.9
=13.5-(3-0.01)-(4-0.1)
=13.5-3+0.01-4+0.1
=13.5-7+0.11
=6.5+0.11
=6.61
=13.5-(3-0.01)-(4-0.1)
=13.5-3+0.01-4+0.1
=13.5-7+0.11
=6.5+0.11
=6.61
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展开全部
13.5-2.99-3.9
=13.5-(3-0.01)-(4-0.1)
=13.5-3+0.01-4+0.1
=13.5-7+0.11
=6.5+0.11
=6.61
=13.5-(3-0.01)-(4-0.1)
=13.5-3+0.01-4+0.1
=13.5-7+0.11
=6.5+0.11
=6.61
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展开全部
解,原式=13.5-(3-0.01)-(4-0.1)
=13.5-3+0.01-4+0.1
=13.5-3-4+0.01+0.1
=6.5+0.11
=6.65
=13.5-3+0.01-4+0.1
=13.5-3-4+0.01+0.1
=6.5+0.11
=6.65
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展开全部
=13.5-3+0.01-4+0.1
=8.5-0.01-0.1
=8.39
结合律
=8.5-0.01-0.1
=8.39
结合律
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展开全部
13.5-2.99-3.9
=3.5-(3-0.01)+(4-0.1)
=13.5-3+0.01-4+0.1
=13.5-7+0.11
=6.5+0.11
=6.61
=3.5-(3-0.01)+(4-0.1)
=13.5-3+0.01-4+0.1
=13.5-7+0.11
=6.5+0.11
=6.61
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
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