Question

Rezolvati in multimea numerelor întregi ecuatiile:
b) -3×(-3x+1)+14=3(7x-3)-10
c)14+2×[3-2(x-3)]:2=37
d)-4-{6-[-3+(-3)+(-5-x)-7]-9}=1
e)5×(7x-1) la puterea 0+2(x+1)=-7(x+3)+3(3x-5)+43
Va rog, ajutați-ma,dau 15 puncte!!!!!!!!

Answer 1

b)
-3(-3x+1)+14 = 3(7x-3)-10
9x-3+14 = 21x-9-10
9x+11 = 21x-19
9x-21x = -19-11
-12x = -30
x= -30/-12
x= +5/2 => x nu aparține Z

c)
14+2•(3-2x+6):2 = 37
14+ 2(9-2x):2 = 37
14+ (18-4x):2 = 37
14+ 9-2x = 37
25-2x = 37
2x = 37-25
2x = 12
x= 12/2
x= 6

d)
-4- {6-[-3+(-3)+(-5-x)-7]-9} = 1
-4- [6-(-3-3-5-x-7)-9] = 1
-4- [6-(-18-x)-9] = 1
-[6-(-18-x)] = 1+4
-(6+18+x) = 5
-6-18-x = 5
-24-x = 5
-x = 5+24
-x = 29
x = -29

e) —–—–—–—–—–