这6题怎么做
2个回答
展开全部
7/13x4/5+6/13÷5/4
=7/13x4/5+6/13x4/5
=(7/13+6/13)x4/5
=1x4/5
=4/5
,
(1/3+1/12-1/6)x24
=1/3x24+1/12x24-1/6x24
=8+2-4
=6
,
5/7+4/7x3/4
=5/7+3/7
=8/7
,
4/9x5/7x9x7
=(4/9x9)x(5/7x7)
=4x5
=20
,
7/8-1/4x1/2
=7/8-1/8
=3/4
,
37x7/36
=(36+1)x7/36
=36x7/36+7/36
=7+7/36
=7又7/36
=7/13x4/5+6/13x4/5
=(7/13+6/13)x4/5
=1x4/5
=4/5
,
(1/3+1/12-1/6)x24
=1/3x24+1/12x24-1/6x24
=8+2-4
=6
,
5/7+4/7x3/4
=5/7+3/7
=8/7
,
4/9x5/7x9x7
=(4/9x9)x(5/7x7)
=4x5
=20
,
7/8-1/4x1/2
=7/8-1/8
=3/4
,
37x7/36
=(36+1)x7/36
=36x7/36+7/36
=7+7/36
=7又7/36
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