1/7+3/8+7/36+29/56+37/63+41/72+53/77+29/84+3/88=?先给10,再给50哦!
问题描述：
1/7+3/8+7/36+29/56+37/63+41/72+53/77+29/84+3/88=?先给10,再给50哦!
答
(1 / 7) + (3 / 8) + (7 / 36) + (29 / 56) + (37 / 63) + (41 / 72) + (53 / 77) + (29 / 84) + (3 / 88)
=1/7+3/8+(3/4-5/9)+(1/7+3/8)+(1/7+4/9)+(1/8+4/9)+(1/7+6/11)+(3/7-1/12)+(1/8-1/11)
=(1/7+1/7+1/7+3/7+1/7)+(3/8+3/8+1/8+1/8)+(4/9+4/9-5/9)+3/4-1/12+(6/11-1/11)
=1+1+(3/9+3/4-1/12)+5/11
=3又11分之5