Răspuns:
a)3*6=2*x
18=2*x
x=18:2
x=9
b)14*9=2*x
126=2*x
x=126:2
x=63
c)15*72=12*x
1080=12*x
x=1080:12
x=90
d)x*13=65*24
x*13=1560
x=1560:13
x=120
e)80*15=x*16
1200=x*16
x=1200:16
x=75
f)5*x=90*7
5x=630
x=630:5
x=126
g)15*x=105*19
15x=1995
x=1995:15
x=133
h)5*124=x*4
4x=620
x=620:4
x=155
i)16x=25*144
16x=3600
x=3600:16
x=225
j)180*8=x*5
5x=1440
x=1440:5
x=288
k)
[tex] \frac{ \times - 1}{8} = \frac{3}{4} [/tex]
4*x-1=3*8
4*x-1=24
x-1=24:4
x-1=6
x=6+1
x=7
l)
[tex] \frac{12}{ \times + 2} = \frac{3}{2} [/tex]
3*x+2=12*2
3x+2=24
x+2=24:3
x+2=8
x=8-2
x=6
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