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Va rog, ex. 15, dau 70 de puncte si coronita, URGENT!!!!

Va Rog Ex 15 Dau 70 De Puncte Si Coronita URGENT class=

Răspuns :

Teodoraalbei
a)3(x-5)=2(x+3)
3x-15=2x+6
3x-2x=6+15
x=21

b)3(2x-3)=3x-2
6x-9=3x-2
6x-3x=-2+9
3x=7
x=7/3
c)3(4x-5)=7(x+5)
12x-15=7x+35
12x-7x=35+15
5x=50
x=10

d)3(3x-7)=5(2x-6)
9x-21=10x-30
9x-10x=-30+21
-1x=-9
x=9

e)3(3x+8)=25x
9x+24=25x
9x-25x=-24
-16x=-24
x=3/2

f)2x=2/7
14x=2
x=2/14
x=1/7

g)5/4=5/x
5x=20
x=4

h)5/6=2x/3
12x=15
x=15/12
a)
3(x-5)=2(x+3)
3x-15=2x+6
x=21

b)
3(2x-3)=3x-2
6x-9=3x-2
3x=7
x=7/3

c)
3(4x-5)=7(x+5)
12x-15=7x+35
5x=50
x=10

d)
3(3x-7)=5(2x-6)
9x-21=10x-30
x=9

e)
3(3x+8)=25x
9x+24=25x
16x=24
x=1,5

f)
2x=2/7
14x=2
x=2/14
x=1/7

g)
10x/3=8/3 x 7 x 5/7
10x/3 = 8/3 x 5
10x = 40
x = 4

h)
6x=15/2
12x=15
x=15/12

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