Question

macar un exercitiu urgeent va rog dau punctajul maxim(57 puncte)

Answer 1

Ex.3
a) (5/6 + 1 si 5/8) : (1/2)^2 - 9 si 1/3 = 
= (5/6 + 13/8) : 1/4 - 28/3 = 
= (20/24 + 39/24) x 4 - 28/3 = 
= 59/24 x  4 - 28/3 = 
= 59/6 - 56/6 = 3/6 = 1/2

b) [(3-2 si 3/7) * 3 si 1/2 - 3/21 - 15/35] * 1 si 1/5 = 
= [(3-17/7)*7/2 - 1/7 - 3/7] * 6/5 =
= [(21/7 - 17/7)*7/2 - 1/7 - 3/7] * 6/5 =
= (4/7 * 7/2 - 1/7 - 3/7) * 6/5 = 
= (2 - 1/7 - 3/7)*6/5 =
= (14/7 - 1/7 - 3/7)*6/5 =
= 10/7 * 6/5 = 2/7 * 6/1 = 12/7

Ex.4
a) 15/25 = 3/5
b) 28/35 = 4/5
c) 44/64 = 11/18
d) 576/432 = 288/216 = 144/108 = 72/54 = 36/27 = 12/9 = 4/3

Ex.5
(ab0+ab)/(ab+ba) = (100a+10b+10a+b)/(10a+b+10b+a) = (110a+11b)/(11a+11b) = 11(10a+b)/11(a+b) = (10a+b)/(a+b) = ab barat/(a+b)

Ex.6
a) 1x/30 este ireductibila:
     x=0 nu se poate, fractia se simplifica prin 10
     x = 1 => fractia este 11/30 ireductibila 
     x = 2 nu se poate, fractia se simplifica prin 6
     x = 3 => fractia este 13/30 ireductibila
     x = 4,5,6,8 nu
     x = 7 DA
     x = 9 DA
     Deci x poate fi1,3,7 sau 9

B) 4 si 2/5 + 1 si 1/5 = 22/5 + 6/5 = 28/5