5/7-(5/7-13/20) ,(12/3-5/6)*36,7/9*5/7-7/9/7能简便计算的简便计算要过程

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5/7-(5/7-13/20) ,(12/3-5/6)*36,7/9*5/7-7/9/7能简便计算的简便计算要过程
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5/7-(5/7-13/20) ,(12/3-5/6)*36,7/9*5/7-7/9/7能简便计算的简便计算要过程
5/7-(5/7-13/20) ,(12/3-5/6)*36,7/9*5/7-7/9/7能简便计算的简便计算要过程

5/7-(5/7-13/20) ,(12/3-5/6)*36,7/9*5/7-7/9/7能简便计算的简便计算要过程
5/7-(5/7-13/20)
=5/7- 5/7 + 13/20
=13/20
.
(2/3-5/6)*36
=(2/3)*36 - (5/6)*36
=24 - 30
=-6
或者:
(1/3-5/6)*36
=(1/3)*36 - (5/6)*36
=12 - 30
=-18
.
7/9*5/7-7/9/7
=(7/9)*(5/7) - (7/9)*(1/7)
=(7/9)*(4/7)
=4/9

5/7-(5/7-13/20)
= 5/7-5/7+13/20
=13/20

, (12/3-5/6)*36,
=(4-5/6)*36
=144 - 30
=114

7/9*5/7-7/9/7
=5/9-7 * 7/9
=-44/7