Question

rezolvati ecuatiile x apartine Z. REPEDEEE

a) 3x+9-2(x+5)=4-2(3-x)

b) 2[18-4(3x-9)]-9=3[19-5(2x-3)]-21​

Answer 1

Răspuns:

a)

3x+9-2x-10=4-6+2x

x-1=2x-2

-x=(-1)

x=1

b)

2(18-12x+36)-9=3(19-10x+15)-21

2(54-12x)-9=3(34-10x)-21

108-24x-9=102-30x-21

6x=81-99

6x=(-18)

x=(-3)

Answer 2

Răspuns:

a). 3x+9-2x-10=4-6+2x

reducem termenii asemenea:

x-1=-2+2x

-1+2=2x-x

x=1

b). 2(18-12x+36))-9=3(19-10x+15)-21

2(54-12x)-9=3(34-10x)-21

108-24x-9=102-30x-21

99-24x=81-30x

99-81=24x-30x

18=-6x

x=-3

Explicație pas cu pas: