(19x + 2 . 52 ) : 14= ( 13 - 82 ) - 42
(19x + 2 . 25 ) : 14= ( 13 - 64 ) - 16
(19x + 50 ) : 14= ( -51 ) - 16
(19x + 50 ) : 14= -67
(19x + 50 ) =-67 .14
(19x + 50 ) =-938
x =(-938-50): 19
x=-52
(19x + 2 . 52 ) : 14= ( 13 - 82 ) - 42
(19x + 2 . 25 ) : 14= ( 13 - 64 ) - 16
(19x + 50 ) : 14= ( -51 ) - 16
(19x + 50 ) : 14= -67
(19x + 50 ) =-67 .14
(19x + 50 ) =-938
x =(-938-50): 19
x=-52
Tìm x
(19x+2.52) :14= (13-8)2 - 42
Tìm x
a)
(x - 23) :14 +25 = 42 - 12002
b)
23.x + 20020. x=995-15:3
C)
x+2.x+3.x+...+9x=459-32
Tìm x
52x-3 - 2 . 52 = 52 . 3
tìm x ng đẻ thoả mãn
1/x(x+1)+1/(x+1).(x+2)+............+1/(x+13).(x+14)=1/x-1/45
tính nhanh
66 . 25 + 5 . 66 + 66 . 14 + 13 .66
Tính nhanh
A=2002×20012001-2001×20022002
B=[(315+372)×3+(372+315)×7]:(26×13+74×14)
x-42= -15+27:3^2
Cho C = 8 + 82 + 83 +.....+ 898 + 899 . Tìm x biết: 7C + 8 = 82x .
5.22+(x+3)=52