Răspuns:
ex 15
a)x+2=-9
x=-9-2
x=-11
b)x-1=-4
x=-4+1
x=-3
c)2x+10=0
2x=0-10
2x=-10
x=-10:2
x=-5
d)1-5x=-19
-5x=-19-1
-5x=-20
x=-20:5
x=-4
e)2x+5=x+6
2x-x=6-5
x=1
f)-9x=27
x=27:(-9)
g)2(x-3)=-6
2x-6=-6
2x=-6+6
2x=0
x=0:2
x=0
h)3(2x-3)=-39
6x-9=39
6x=39+9
6x=48
x=48:6
x=8
i)x:(-8)=2
x=2•(-8)
x=-16
j)5x=-20
k)5-4x=-3
-4x=-3-5
-4x=-8
x=-8:(-4)
x=2
l)3-2x=-x+6
-2x+x=6-3
-x=3 |•(-1)
sper că te-am ajutat
