Question

请做做这两道题，有简便算法就用简便算法做，谢谢，急！

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Answer 1

望采纳

追问

手机出了些毛病，请问能发来字的吗？真抱歉

追答

[8/13-(8/9-5/13)]÷10/81
=[8/13-8/9+5/13]÷10/81
=[8/13+5/13-8/9]×81/10
=1/9×10/81
=9/10

6/7÷[(11/12-3/4)×9/14]
=6/7÷[1/6×9/14]
=6/7×28/3
=8

追问

十分感谢！！

Answer 2

=(8/13-8/9+5/13)x81/10
=（8/13+5/13-8/9）x81/10
=（1-8/9）x81/10
=1/9 x 81/10
=9/10

追答

=6/7÷ ［（11/12-9/12）x9/14］
=6/7÷ (1/6x9/14)
=6/7÷ 3/28
=6/7 x 28/3
=8