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rezolvati in Z ecuatiile
a)x+7=-1
b)x-7=13
c)3x=18
d)-5x=20
e)x:7=-4
f)28:x=-7
g)2x+9 =5
h)4x-9=-13
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Răspuns :

Rodica01ask

Răspuns:

a)x+7=-1

x=-1-7

x=-8

b)x-7=13

x=13+7

x=20

c)3x=18

x=18/3

x=6

d)-5x=20

x=-20/5

x=-4

e)x:7=-4

x=7*(-4)

x=-28

f)28:x=-7

x=28/(-7)

x=-4

g)2x+9 =5

2x=5-9

2x=-4

x=-4/2

x=-2

h)4x-9=-13

4x=-13+9

4x=-4

x=-4/4

x=-1

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