Question

URGENT, va rog mult!! ​

Answer 1

Răspuns:

Explicație pas cu pas:

a)

x=(9*6)/27

x=54/27

x= 2

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b)

2y=6*3

2y=18

y=18:2

y=9

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c)

5/10z=18

z=(18*10)/5

z=36

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d)

3a= 1,2*10

3a=12

a= 12:3

a= 4

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e)

7b= 4*2,1

7b=8,4

b= 8,4:7

b=1,2

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f)

1,12 u=2,52*1,8

1,12u=4,536

u= 4,536:1,12

u= 4,05

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g)

2(x+3)=5*6

2x+6=30

2x=30-6

2x=24

x=24:2

x= 12

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h)

7x*27=45*42

7x*27=1890

7x= 1890:27

7x=70

x= 70:7

x= 10

-

2)

a)

7a= 28*3

7a= 84

a= 84:7

a=12

-

b)

3,5a= 7*2

3,5a= 14

a= 14:3,5

a=5

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c)

a*a=9*4

a²=36

a=√36

a= 6

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d)

2a*0.9=21*0.6

2a*0.9=12,6

2a= 12,6:0,9

2a=14

a= 14:2

a= 7