21+21/3 = 14
18+20 = 19
24+24/3 = 26
28+28/4 = 14
б)
36+36/6 = 12
35+30/5 = 13
48+48/8 = 12
42+42/7 = 12
в)
27+30/ 3=19
40+36/4 =19
50+35/5 = 17
28+40/4 =17
г)
74+74/2 =74
82+82/2 =91
200+46/2 = 123
д)
26+100/2 = 63
120+9/3 = 42
99+21/3 = 40
77+77/7 =22
5,92 : 3,7. Можем приписать ноль к 3,7, получится 5,92:3,70. 5,92:3,70=1,6.
2*3²ˣ - 5*3ˣ - 1323 = 0 3ˣ = a
2a² - 5a - 1323 = 0 D = b²-4ac = 25+10584 = 10609 =103²
a₁ = (-b+√D)/2a = (5+103)/4 = 27
a₂ =(-b-√D)/2a = (5-103)/4 = -24,5
3ˣ = 27 3ˣ = -24,5
3ˣ = 3³ ∅
x = 3
Ответ: а) {3}
36* (х-3)=10-2* (х+2)
36х-108=10-2х-4
36х-108=6-2х
36х+2х=6+108
38х=114
х=3