Răspunsuri

2014-11-11T18:49:58+02:00
Not: (42/x-15/3)=a
=> 216/[16+a/2]=9
216/(32+a)/2=9
216/(32+a)=18
18(32+a)=216
32+a=12
a=-20
=> 42/x-15/3=-20
(126-15x)/3x=-20
126-15x=-60x
45x=-126
x=-42/15
x=-14/5
2014-11-11T18:51:16+02:00
216 : [16+(42:x - 15:3):2] = 9
216 : [16+(42:x -5):2]=9 | *216
16+(42:x-5):2=1944 | -16
(42:x-5):2 = 1928 | x2
42:x-5 = 3356 | + 5
42:x = 3861 : 42
x=91,9