Question

va rog ex 4 punctul e, f, g, h, i

Answer 1

e)
5(x-7)=3(x-4)-13
5x-35=3x-12-13
5x-35=3x-25
5x-3x=(-25)+35
2x=10
x=10:2
x=5
f)
3 (2z+7)+4=5 (z-3)
6z+21+4=5z-15
6z+25=5z-15
6z-5z=-15-25
z=-40
g)
[(4:5)×x]-2={[2intregi(1:2)]×x}-(1:5)
(4x:5)-2=[(5:2)×x]-(1:5)
(8x-20):10=(5x:2)-(1:5)
(8x-20):10=(25x-2):10}=)×10
8x-20=25x-2
8x-25x=-2+20
-17x=18
x=-(18:17)
x=-1.05
h)
(5x:2)+(1:6)=(7x:3)+1
(15x+1):6=(7x+3):3
3(15x+1)=6(7x+3)
45x+3=42x+18
45x-42x=18-3
3x=15
x=15:3
x=5
I)
-2x=3(x-5)+6
-2x=3x-15+6
-2x=3x-9
-2x-3x=-9
-5x=-9
x=(-9):(-5)
x=9:5
x=1.8