(x-3).(2x+6)=0
x-3=0 2x+6=0
x =0+3 2x =0-6
x =3 2x =-6
x =-6:2
x =-3
Vay x = 3 hoac x = -3
( x-3).(2x+6)=0
Th1:x-3=0
=>x=3
Th2;2x+6=0
=>2x=-6
=>x=-3
( x-3).(2x+6)=0
Th1:x-3=0
=>x=3
Th2;2x+6=0
=>2x=-6
=>x=-3
( x-3).(2x+6)=0
Th1:x-3=0
=>x=3
Th2;2x+6=0
=>2x=-6
=>x=-3
Bài 13: Tìm x biết: a) (x-2)(x-3)-D0. b) (x-3)(x-4)-0. c) (x-7)(6-x)=0. d) (x-3)(x-13)=0. The Bài 14: Tìm x biết: a) (12-x)(2-x)=0. b) (x-33)(11-x)=0. c) (21-x)(12-x)=0. d) (50-x)(x-150) =0. Bài 15: Tìm x biết: a) 2x +x = 45. b) 2x +7x = 918. c) 2x+3x 60+5. d) 11x+22x 33.2.
Tìm x
(2x-7)+17=6
12-2.(3-3x)=-2
-14+3.(-x+5)=-20
-90:5.(-3-2x)=6
(x+1).(x-3)=0
(2x-2).(x+4)=0
(22+4).(x+3)=0
(5-x).(6-2x)=0
3.(x+1)+5=x+8
-4.(2x+9)-(-8x+3)-(x+13)=0
B1:Tìm x
a) (x-7).(x+3)<0
b) (2x+6).(x-5) nhỏ hơn hoặc bằng 0.
B2:Tìm x
a) (5x+8)-(2x-15)+21=2x-5
b) 3.(x-5)-4(x+8)=-12
c) |2x+6|-(-5)^2=3
+. là dấu nhân"x" nhé!
tìm số nguyên x biet
-2.(x+6)+6.(x-10)=8
x+5=20-(12-7)
(3x-9).(2x+6)=0
(2x+1).(3-x)=0
Tìm x a) x.(2x+6)=0 b) (x-3).(-3x+15)=0 c) x ngũ 2 - 4x=0
Tìm số nguyên x, sao cho :
b) (4-2x) . (x+3)=0
c) -x . ( 8-2x)=0
d) (2x-6) . ( x-3)=0
Mấy bạn giúp mk nha !!!!
Tìm x
a.2x+(1+2+3+4+...+100) = 15150
b.(x+1)+(x+2)+(x+3)+(x+4)+(x+5)+(x+6)+(x+7)+(x+8)=36
c.0+0+4+6+8+...+2x=110
Tìm x:
a)2x.(x+3)+2x.(6-x)=7
b)4.(x+1)-2.(x-3)-3.(x-4)=0
Tìm x biết
(2x-3)(6-2x)=0
1/3x+2/5 (x-1)=0
Tìm x, y thuộc Z , biết :
a) ( 2x - 10 ) ^ 2 + ( 4 - 2y ) ^ 2 = 0
b) ( x - 2 ) . ( x + 3 ) > 0
c) ( x - 2 ) . ( x + 3 ) < 0
d) ( 2x - 6 ) . ( x - 5 ) > 0
e) ( 2x - 6 ) . ( x - 5 ) <0
f) ( x + 4 ) . ( 2 - x ) < 0
g) ( x + 4 ) . ( 2 - x ) > 0
h) ( x ^ 2 + 3 ) . ( 5x + 20 ) < 0
