Răspuns:
a)
100 x[ 24 - 6 x (X-3)+2]:3 = 300 |x3
100x[24-6X+18+2]=900 |:100
24-6x+18+2=9
24-6x+20=9
44-6x=9 |+6x
44=9+6x |-9
35=6x |:6
x=35:6
b)
a - 123 x 4 + 555 : 3 = 593
a - 492 + 185=593
a-492=593-185
a-492=408
a=408+492
a=900
d)
[(6 x y+ 8)+ 5] x 3=170-5
[(6 x y+ 8)+ 5] x 3=165
(6 x y+ 8)+ 5 =165 : 3
(6 x y+ 8)+ 5 =55
6 x y+ 8=55-5
6 x y+ 8=50
6 x y=50-8
6 x y=42
y=42 : 6
y= 7
e)
{[n x 3] x 4} : 5 -6=6
(n x 12) : 5=6 +6
(n x 12) : 5=12
n x 12 =12 x 5
n= 12 x 5 : 12
n=5
