Question

Пожалуйста помогите хоть одного

Answer 1

1) (13-9)(13+9)= 4*22= 88

2) (20-19)(20+19)= 1*39= 39

3) (2,2-2,8)(2,2+2,8)= -0,6*5= -3

4) (3,5-3,7)(3,5+3,7)= -0,2*7,2= -1,44

13) (51-41)(51+41)= 10*92= 920

14) (54-46)(54+46)= 8*100= 800

15) (76-24)(76+24)= 52*100= 5200

16) (328-172)(328+172)= 156*500= 78000

Answer 2

1)13² - 9² = (13 - 9) * (13 + 9) = 4 * 22 = 88

2) 20² - 19² = (20-19) * (20+19) = 1 * 39 = 39

3) 2,2² - 2,8² = $(frac{11}{5})^{2} - (frac{14}{5})^{2}$ = $frac{121}{25} - frac{196}{25} = -3$

4) 3,5² - 3,7² = $(frac{ 7}{2})^{2} - (frac{37}{10})^{2} = frac{49}{4} - frac{1369}{100} = -frac{36}{25}$