(3+5/7-2/3)×(1/5+1/7+1/13)-(1/5-1/7+1/13)×3+(1/5+1/7+1/13)×(2/3-7_数学解答

(3+5/7-2/3)×(1/5+1/7+1/13)-(1/5-1/7+1/13)×3+(1/5+1/7+1/13)×(2/3-7/5)
有一个打错了
(3+5/7-2/3)×(1/5+1/7+1/13)-(1/5-1/7+1/13)×3+(1/5+1/7+1/13)×(2/3-7/5)

人气：356 ℃　时间：2020-05-30 16:23:27

解答

(3+5/7-2/3)×(1/5+1/7+1/13)-(1/5-1/7+1/13)×3+(1/5+1/7+1/13)×(2/3-7/5)=(1/5+1/7+1/13)×(3+5/7-2/3+2/3-7/5)-(1/5-1/7+1/13)×3=(1/5+1/7+1/13)×(3+5/7-7/5)-(1/5-1/7+1/13)×3-------------------------如果...