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a) 5.3+(x:2)=x

b)40*2x=x^2
c)36*y^2=6*2y
d) (10+z)*z=81



Răspuns :

a) 5,3+x\2=x
10,6+x=2x
10,6=2x-x
x=10.6

b)
40*2x=x^2
80x-x^2=0
x(80-x)=0
x=0
80-x=0
x=80

c)36*y^2=6*2y \:12
3y^2=y
3y^2-y=0
y(3y-1)=0
y=0
3y-1=0
3y=1
y=1/3