Question

3.aflati termenul necunoscut notat cu x din proportiile
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Answer 1

a)x=9*4/3= 36/3=12
b)x=8*7/4=56/4=14
c)x=7*10/5=70/5=14
d)x=72*2/9=16
e)x=77*3/11=21
f)x=4*65/13=20
c)3*(x-7)=36
x-7=12
x=12+7
x=19
d)3*(x+5)=45
x+5=15
x=15-5
x=10

Answer 2

Răspuns:

a.x=12

b.x=14

c.x=14

f.x=16

g.x=21

h.x=20

c.x=5

d.x=10

Explicație pas cu pas:

a.x*3=4*9

3x=36

x=36/3

x=12

b.8*7=4*x

56=4x

x=56/4

x=14

c.7*10=x*5

70=5x

x=70/5

x=14

f.x*9=2*72

9x=144

x=144/9

x=16

g.77*3=11*x

231=11x

x=231/11

x=21

h.4*65=x*13

260=13x

x=260/13

x=20

c.3(x-7)=4*9

3x-21=36

3x=36-21

3x=15

x=15/3

x=5

d.3(x+5)=9*5

3x+15=45

3x=45-15

3x=30

x=30/3

x=10