Question

номер 7
помогите срочно!!!

Answer 1

9/10 - 8/4= 18/20 - 40/20 = -22/40 = -11/20
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

Answer 2

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