Răspuns:
Explicație pas cu pas:
a)
x=(9*6)/27
x=54/27
x= 2
-
b)
2y=6*3
2y=18
y=18:2
y=9
c)
5/10z=18
z=(18*10)/5
z=36
d)
3a= 1,2*10
3a=12
a= 12:3
a= 4
e)
7b= 4*2,1
7b=8,4
b= 8,4:7
b=1,2
f)
1,12 u=2,52*1,8
1,12u=4,536
u= 4,536:1,12
u= 4,05
g)
2(x+3)=5*6
2x+6=30
2x=30-6
2x=24
x=24:2
x= 12
h)
7x*27=45*42
7x*27=1890
7x= 1890:27
7x=70
x= 70:7
x= 10
2)
7a= 28*3
7a= 84
a= 84:7
a=12
3,5a= 7*2
3,5a= 14
a= 14:3,5
a=5
a*a=9*4
a²=36
a=√36
a= 6
2a*0.9=21*0.6
2a*0.9=12,6
2a= 12,6:0,9
2a=14
a= 14:2
a= 7
