tìm x

2^x+2 - 2^x = 96

1.it is not a very pretty town , but the(surround).......... are beautiful

co ton tai hay ko so nguyen a,b,c thoa man tat ca cac dieu kien sau abc + a = -625 , abc + b = -633 , abc + c = -597

x ∈ B[9] = { 0 ; 9 ; 18 ; 27 ; 36 ;45 ;54 ;63 ;72 ; 81 ;90 ;...............}

vi 45 ≤ x ≤ 81

Suy ra : x ∈ { 45 ; 54 ; 63 ; 72; 81 }

b, |x+3| = 9

ta co 2 truong hop :

trường hợp 1 : x + 3 = -9

x = -9 - 3

x = -12

trường hợp 2 : x + 3 = 9

x = 9 - 3

x = 6

vay x = 6 ; x = -12

a, ta co :

x ∈ B[9] = { 0 ; 9 ; 18 ; 27 ; 36 ;45 ;54 ;63 ;72 ; 81 ;90 ;...............}

vi 45 ≤ x ≤ 81

Suy ra : x ∈ { 45 ; 54 ; 63 ; 72; 81 }

b, |x+3| = 9

ta co 2 truong hop :

trường hợp 1 : x + 3 = -9 trường hợp 2 : x + 3 = 9

x = -9 - 3 x = 9 - 3

x = -12 x = 6