2x/4+x/4=1/12
3x/4-1/12=0
9x/12-1/12=0
x=1/9
Вроде так)
1/2 = 5/10 = 50/100 = 500/1000 = 0,5
2/5 = 4/10 = 40/100 = 400/1000 = 0,4
7/5 = 14/10 = 140/100 = 1400/1000 = 1,4
4/5 = 8/10 = 80/100 = 800/1000= 0,8
4(9у2+6у+1)-27=16у2+36у-36у-81+2(10у2+4у-35у-14)
36у2+24у+4-27=16у2+36у-36у-81+20у2+8у-70у-28
87у=-86
у=-86/87