(3/4- 8 1/4) ÷ 3 1/2 (-1 7/8+3 1/8) ÷1 3/7
----------------------- - --------------------------- =
(-4 2/3+5) ÷ 10 (-1 3/8 +2) ÷ 3 1/8

<img src="content://com.samsung.android.memo/file/e798b598-a2cd-a9ed-0000-0158c5fda3fb" orientation="0" altText="null" width="484" />

3/4-1/2+7/8=9/81) 3/4-1/2=3/4-2/4=1/42) 1/4+7/8=2/8+7/8=9/85/6-2/3+1/4=10/241)  5/6-2/3=5/6-4/6=1/62)  1/6+1/4=4/24+6/24=10/241/3-(1/9+1/6)=1/181)  1/9+1/6=6/54+9/54=15/54=5/182)  1/3-5/18=1/18

(3/4 - 8 1/4) ÷ 3 1/2        (-1 7/8 + 3 1/8) ÷ 1 3/7--------------------------  --   ------------------------------    = - 68 37/56,(-4 2/3 + 5) ÷ 10             (-1 3/8 + 2) ÷ 3 1/81) 3/4 - 8 1/4 = 3/4 - 33/4 = - 30/4 = - 7 2/4 = - 7 1/2,2) -7 1/2 ÷ 3 1/2 = -15/2 ÷ 7/2 = - 15/2 * 2/7 = - 15/7 = - 2 1/7,3) -4 2/3 + 5 = 1/3,4) 1/3 ÷ 10 = 1/3 * 1/10 = 1/30,5) -2 1/7 ÷ 1/30 = -15/7 ÷ 1/30 = -15/7 * 30/1 = -450/7 = -64 2/7,6) -1 7/8 + 3 1/8 = -15/8 + 25/8 = 10/8 = 1 2/8 = 1 1/4,7) 1 1/4 ÷ 1 3/7 = 5/4 ÷ 10/7 = 5/4 * 7/10 = 7/8,8) -1 3/8 + 2 = 5/8,9) 5/8 ÷ 3 1/8 = 5/8  ÷ 25/8 = 5/8 * 8/25 = 1/5,10) 7/8 ÷ 1/5 =7/8 * 5/1 = 35/8 = 4 3/8,11) -64 2/7 - 4 3/8 = - (64 2/7 + 4 3/8) = - (68 + 16/56 + 21/56) = - 68 37/56