Question

rezolvati in Z ecuatiile
a)3x+7=10
b)2x+4=-4
c)2x×(-5)=-20
d)x:(-8)=7
e)|x|=5​

Answer 1

a)3x+7=10

3×=10-7

3x=3

x=3:3

x=1

b)2x+4=-4

2x=-4-4

2x=-8

x=-8:2

x=-4

c)2x×(-5)=-20

2x=-25+(-5)

2x=-30

x=-30:2

x=-15

d)x:(-8)=7

x=(-8)×7

x=-56

e)|x|=5

x=5 sau -5