Bạn pahs ngowacj ra nha
Phá ra dc
x-9+x+5=0
(x+x)+(5-9)=0
2x+(-4)=0
2x=0-(-4)=4
x=4:2=2
Ủng hộ mk nha
(x - 9) + (x + 5) = 0
=> x - 9 + x + 5 = 0
=> 2x - 4 = 0
=> 2x = 4
=> x = 2
1) (3x-6)(x+5)+4(x-2)=0
2) 3(x-5)(2x+9)+3x-15=0
3) (x2-16)(12-4x)=0
4) (9-x2)(4x-8)=0
5) (8-x3)(5x-125)=0
6) 4x=8
Cho biểu thức sau : A = 9x +17/ x 1 Để A nguyên thì x cần đạt giá trị : Chọn câu trả lời đúng:
A. x ∈ { - 9 ; - 5 ; - 3 ; - 2 ; 0 ; 1 ; 4 ; 7 } B. x ∈ { - 9 ; - 5 ; - 3 ; - 2 ; 0 ; 1 ; 3 ; 8 }
C. x ∈ { - 8 ; - 5 ; - 3 ; - 2 ; 0 ; 1 ; 3 ; 7 } D. x ∈ { - 9 ; - 5 ; - 3 ; - 2 ; 0 ; 1 ; 3 ; 7 }
/x-5/=0
/3x-9/=0
(x+7).(4x-16)=0
(x+5).(x+10)=0
1, 72-3./x+1/=9
2, 17-(43-/x/)=45
3, 3/x-1/-5=7
4, -12.(x-5)+7.(3-x)=5
5, (x-2) . (x+4)=0
6, (x-2).(x+15)=0
7, (7-x).(x+19)=0
8, -5<x<1
9, /x/<3
10, (x.3).(x-5)<0
a)x ( x + 0 ) = 0
b) ( x - 1 ) ( 7 - x ) = 0
c) ( -x + 5 ) ( 3 - x ) = 0
d) ( x + 5 ) + ( x - 9 ) = 13
Tính:
a) 2^5 x 13^12 x 7^8 : 27 x 13^10 x 7^9
b) 2^n x 11 x 3 : 6^n x 3
c) 5^5 x 7 x 9^5 : 15^10
d) 7 x 8^10 x 27^9 - 8 x 9^13 x 2^27 : 7 x 6^26 x 2^2 - 2^4 x 8^3 x 27^9
e) 2^2^1^2015
f) 2015^0^2015^0^2015
tìm x bít
3/x+4/x+5/x=0
5/6+x-7/9=0
(x+7)(x-9)=0
/2x-5/-7=22
(x-2)(5-x)=0
1. Tìm x:
a) -3.(x-5)+2.(x+3)=-4
b) (x+5).(x-9)=0
c) (-7+x).(5-x)=0
( x +5).(3x-12)>0
(x-9).(x+5)<0
