合理计算(能简算要简算):20/27÷(5/6-1/18+7/24)

问题描述:

合理计算(能简算要简算):20/27÷(5/6-1/18+7/24)

20/27÷(5/6-1/18+7/24)
=20/27÷(60-4+21)/72
=20/27÷77/72
=20/27X72/77
=160/231

20/27÷(5/6-1/18+7/24)=20/27÷(15/18-1/18+7/24)
=20/27÷(14/18+7/24)
=20/27÷(56/72+21/72)
=﹙20/27﹚X﹙72/77﹚
=20/3X8/77
=160/231

=20/27÷(15/18-1/18+7/24)
=20/27÷(14/18+7/24)
=20/27÷(56/72+21/72)
=20/27X72/77
=20/3X8/77
=160/231