1.3/(1+(1/12))
1.3/(13/12)
(13/10)*(12/13)
12/10
1.2
1) t²-10*t+25=t²-2*t*5+5²=(t-5)². Ответ: t²-10*t+25=(t-5)².
2) x²-3*x-10=x²-2*x*3/2-10=(x-3/2)²-10-(3/2)²=(x-3/2)²-49/4=(x-3/2)²-(7/2)²=(x-3/2+7/2)*(x-3/2-7/2)=(x+2)*(x-5). Ответ: x²-3*x-10=(x+2)*(x-5).