Question

Rezolvați in multimea Q ecuația si efectuați verificarea:a)0,47x-0,14x=1,65 b)(4x-1):3=-1/3 c)7/9x-2/3x=3 d)-3×(2-15x)=-6.Dau coroana.×-înmulțire

Answer 1

a)0,47x-0,14x=1,65
0,33x=1,65
x=1,65:0,33
x=5
S={5}

b) (4x-1):3=-1/3
4x-1/3=-1/3
4x-1=-1
4x=-1+1
4x=0
S= ¢

c) 7/9x-2/3x=3
7-6/9x=3
1/9x=3 /1
1=27x
x=1/27
S={1/27}

d) -3×(2-15x)=-6
-6-45x=-6
-45x=-6+6
-45x=0
S={0}