Question

РЕШИ УРАВНЕНИЯ (x-8)(x-12)=0 , 7u+14=21+7u , u*7=u*5 , 10+30t=20t+100

Answer 1

(x-8)(x-12)=0х²-12х-8х+96=0
х²-20х+96=0
Д=(-20)²-4*1*96=400-384=16
х1=20+4/2=24/2=12
х2=20-4/2=16/2=8

10+30t=20t+10010+30t-20t-100=0
-90+10t=0
10t=90/10
t=9