\(19.\left(2x-12\right)\left(3x+9\right)=0\\ \Rightarrow\left(2x-12\right)\left(3x+9\right)=0\\ \Rightarrow\left\{{}\begin{matrix}2x-12=0\\3x+9=0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}2x=12\\3x=-9\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=6\\x=-3\end{matrix}\right.\\ \)
\(Vậy\) \(có\) \(2\) \(số\) \(x\) \(thỏa\) \(mãn\):\(x=\left\{6;-3\right\}\)
[7x-19]-[5x-12]=3x-[9-2x]-1
tìm số nguyên x,biết:
(4+2x).(9-3x)=0
(3x-19)3 = 125
(7x-19)-(5x-12)=3x-(9-2x)-1
cíu cíu tui zớiiiiiiiiii
1 . Tính hợp lí :
a . 727 - ( 182 + 727 )
b. ( 258 - 79 ) - ( 121 - 142 )
c. 2016 - ( 391 + 2016 ) - 9
d. 15 . 12 - 3 . 5. 10
e. 45 - 9 . ( 13 + 5 )
g . 29 . ( 19 - 13 ) - 19 . ( 29 - 13 )
2. Tìm x thuộc Z , biết :
a. 4 . ( x + 1 ) - ( 3x - 1 ) = 14
b. ( x2 - 9 ) . ( x + 2 ) = 0
c . ( x 2 + 9 ) . ( 2x - 4 ) = 0
d. xy + 2x - y = 0
a) (x-12)-(2x+31) = 6
b) 2(x+7)-3(x-2)= -2
c) (3x+19) (11-x) = 0
d) x+3-3(x+5) = x-9
e) -2 (x+1) +5 (x-2) = x-14
a) 42-x=5
b) 15.(x+4)=75
c) 27+3x=9^8.9^7
d) x+18=12
e) 2x-15=-19
f) 36 :(x^3-12)=-3
g)x+15=35
h) 2x-13=3^2
bài 19: tìm x
a) 5 . ( x - 7 ) = 0
b) 25 ( x - 4 ) = 0
c) ( 34 - 2x ) . ( 2x - 6 ) = 0
d) ( 2019 - x ) . ( 3x - 12 ) 0
e) 57 . ( 9x - 27 ) = 0
f) 25 + ( 15 - x ) = 30
g) 43 - ( 24 - x ) = 20
h) 2 . ( x - 5 ) - 17 = 25
i) 3 . ( x + 7 ) - 15 = 27
j) 15 + 4 . ( x - 2 ) = 95
k) 20 - ( x + 14 ) = 5
l) 14 + 3 . ( 5 - x ) = 27
timx
a. 5x+3x bang 3 6 chia 3 3.4+12
b. 4x+2x bang 68-2 19 chia 2 16
c. 5x+x bang 39-3 11 chia 3 9
d. 7x-x bang 5 21 chia 5 19 +3.2 2-7 0
bài 19: tìm x
c) ( 34 - 2x ) . ( 2x - 6 ) = 0
d) ( 2019 - x ) . ( 3x - 12 ) 0
e) 57 . ( 9x - 27 ) = 0
f) 25 + ( 15 - x ) = 30
g) 43 - ( 24 - x ) = 20
h) 2 . ( x - 5 ) - 17 = 25
i) 3 . ( x + 7 ) - 15 = 27
j) 15 + 4 . ( x - 2 ) = 95
k) 20 - ( x + 14 ) = 5
l) 14 + 3 . ( 5 - x ) = 27
nhanh nha, mik tick cho, ccau trình bày dễ hiểu, ko cần ''hoặc''
