48-1
х-0.4
х=48*0.4=19.2(стр)
4,5*3-2,6=10,9 5*(2*4)=40
-x^2+5x+14>0
D=25+56=81
Х=-2
Х=7
Відповідь х є (-2;7)
A = {a_1, a_2}
B = {b_1, b_2, b_3}
C = {c_1, c_2, c_3, c_4}
|AxBxC| = |A|*|B|*|C| = 2*3*4 = 24
A = {0,1}
B = {0,1,2}
C = {0,1,2,3}
АхВхС = {
(0,0,0),
(0,0,1),
(0,0,2),
(0,0,3),
(0,1,0),
(0,1,1),
(0,1,2),
(0,1,3),
(0,2,0),
(0,2,1),
(0,2,2),
(0,2,3),
(1,0,0),
(1,0,1),
(1,0,2),
(1,0,3),
(1,1,0),
(1,1,1),
(1,1,2),
(1,1,3),
(1,2,0),
(1,2,1),
(1,2,2),
(1,2,3) }