3)

(33+47)²=80²=6400

(95-5)² = 90 ² = 8100

(41+11)(41-11)=52*30=1560

(59,5+39,5)(59,5-39,5)=99*20 = 1980

4)

х²-121=0

х²=121

х=√121

х=11

х=-11

х²+26х+169=0

(х+13)²=0

х+13=0

х=-13

х²-28х+196=0

(х-14)²=0

х-14=0

х=14

5)

а) =6²-(p²-2pt+t²) = 6² - (p-t)² = (6-p+t)*(6+p-t)

Verified answer