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18X3/70.65X8/13-2/7*185/13÷1又7/13简便运算,求步骤.清楚明了,快解答
题目详情
18X3/7 0.65X8/13-2/7*18 5/13÷1又7/13 简便运算,求步骤.清楚明了,快解答
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答案和解析
18X3/7
=(14+4)x3/7
=14x3/7 +4x3/7
=6+12/7
=7又5/7
0.65X8/13-2/7*18
=13/20x8/13-2/7x18
=2/5-36/7
=14/35-180/35
=-166/35
5/13÷1又7/13
=5/13÷20/13
=5/13x13/20
=5/20
=1/4
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