Ответ:
Пошаговое объяснение:
8:10 2/3 = 8: 32/3 = 3/4
9 5/7 : 1 23/28 = 68/7 : 51/28 = (68*28)/(7*51) = (4*17*4*7)/(7*3*17) =16/3 = 5 1/3
1 2/15 : (3 7/9 - 2 3/7 ) = 17/15 : (34/9 + 17/7) = 17/15 : ((238+153)/63) = 17/15 : 391/63 = 17*63/15*391 = 21/5*23 = 21/115
3+5=8
+ +
10-3=6
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13 8
Я так думаю.
-(-2 1/3+4,5)+(-1 7/12+0,75-2)=
2 1/3-4,5-1 7/12+0,75-2=-5
1)2 1/3-1 7/12=2 4/12-1 7/12=9/12=3/4
=0,75
2)-4,5+0,75-2=-5,75
3)0,75-5,75=-5