Ответ:
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Объяснение:
6^-1*2^-1 = 1/6*1/2=1/12
1/12:1/12^3=1/12*12^3/1 = 12^3/12^1 = 12^3-1 = 12^2 = 144.
15d + 31 = -10
15d = - 41
d = -41/15
(a+ b)/8c³ * 16c³/(a+b) =2
(m+n)/(m-n) : 3m/(m-n)=(m+n)/(m-n) * (m-n)/3m=(m+n)/3m
(x+y)/(x-1) : (y-2)(/(4x- 4)=(x+y)/(x-1) * (4(x-1))/(y-2)=4(x+y) / (y-2)
(5n-5m)/(3(a+2)) * (2a²+a³)/(n-m)=(5(n-m))/(3(a+2)) * (a²(2+a))/(n-m)=5a²/3
.
(7a+7b)/5c² * 14c/(6b+6a)=(7(a+b))/5c² * 14c/(6(b+a))=21/30c=7/10 c
при с=3,5
7*3,5/10=24,5 : 10=2,45
(b-5)/(4-4c) : (b² -25)/(c-c²)=(b-5)/(4(1-c)) * (c(1-c))/((b-5)(b+5))=c/(4(b+5))
при b=2, c= -35
- 35/(4(2+5))= - 35/28= - 5/4= - 1.25
Х задуманное число
(х+75):3=60
х+75=60*3
х=180-75
х=105