Question

Sa se rezolve in Z ecuatiile ; a) 7-3x=-23-8x , b) 1-4(2x-1)=3 (x+2)+10 , c)3-5(2x-1)=4 (x+2)+14 , d)modul x+1 =3 , e)2 + modul x-3=7 .

Answer 1

a)7-3x=-23-8x
-3x+8x=-23-7
5x=30
x=30supra5
x=6

b)1-4(2x-1)=3(x+2)+10
1-4×2x-4×1=3×x+3×2+10
1-8x-4=3x+6+10
-8x-3x=6+10-1+4
11x=11
x=11supra11
x=1

c)3-5(2x-1)=4(x+2)+14
3-5×2x-5×1=4×x+4×2+14
3-10x-5=4x+8+14
-10x-4x=8+14-3+5
14x=22-8
14x=14
x=14 supra14
x=1

d) x+1=3
x=3-1
x=2


e) x-3=7
x=7+3
x=10


la d si la e nu sunt sigura