9/10-2= -1 1/10
---------------------------
16/40+35/40=51/40
--- 11 *40 11 * 4
-------------------= ----- ---------------- = ---- 44/51
----- 10* 51 1 * 51
Ответ: -44/51
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2/5+7/8 = 16/40 + 32/40=48/40= 1 1/5
-11/20 : 11/5 = -11*5/20*11=-55/220=-1/4
9/10-2= -1 1/10
---------------------------
16/40+35/40=51/40
--- 11 *40 11 * 4
-------------------= ----- ---------------- = ---- 44/51
----- 10* 51 1 * 51
Ответ: -44/51