1、简便运算 (2/69+2/71)*23+25/71 6/7-5/9*6/7

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1、简便运算 (2/69+2/71)*23+25/71 6/7-5/9*6/7
1、简便运算 (2/69+2/71)*23+25/71 6/7-5/9*6/7

1、简便运算 (2/69+2/71)*23+25/71 6/7-5/9*6/7
(2/69+2/71)*23+25/71
=(2/69)*23+2/71*23+25/71
=2/3+46/71+25/71
=2/3+1
=5/3
6/7-5/9*6/7
= 6/7*(1-5/9)
= 6/7*(4/9)
=8/21

(2/69+2/71)*23+25/71
=(2/69)*23+(2/71)*23+25/71
=2/3+46/71+25/71
=2/3+(46/71+25/71)
=2/3+1
=1又2/3

6/7-5/9*6/7
=6/7(1-5/9)
=(6/7)*(4/9)
=8/21