=>|2x+1|=3x+5
\(\Leftrightarrow\left\{{}\begin{matrix}x>=-\dfrac{5}{3}\\\left(3x+5-2x-1\right)\left(3x+5+2x+1\right)=0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x>=-\dfrac{5}{3}\\\left(x+4\right)\left(5x+6\right)=0\end{matrix}\right.\Leftrightarrow x=-\dfrac{6}{5}\)
b1:
[4+2x]=-3x [3x-1]+2=x
[x+15]+1=3x [2x-5]+x=2
b2:
[2x-5]=x+1 [3x-2]-1=x
[3x-7]=2x+1 [2x-1]+1=x
Bài 2 Tìm x biết 1, (2x-2).(3x+1)-(3x-2).(2x-3)=5 2,(1-3x).(3x-5)-(2x-4)(2-3x)=x-6 3,(2x-1).(4x^2+2x+1)-(2x+1)(4x^2-2x+1)=5x+6 Giúp tớ với
Tìm x biết
2(x - 3) + 5 = 3x - 1
2x(3x + 2) - 5 = 3( 2x^2 - 2x + 1)
(3x - 2)(2x - 3) + 5 = 5
giải chi tiết giùm mình
Tìm nghiệm : a) (2x-3).(2x+3) B)(x-4).(x-1).(x-2) C)2x(3x-1)-3x(5+2x) D)(3x-2).(3x+2)-4.(x-1)
tìm x ;
a , | x | + | x + 2 | = 3
b , | 2x + 1 | + | x + 8 | = 4x
c, | 3x + 5 | + | 3 - 3x | = 2x - 1
d , | 2x - 1 | - | 3x - 3 | = 2x - 5 +( x - 2)
e , | 3x - 1 | + | x - 2 | = 2x + 3
Bài : Rút gọn
1) (3x - 5).(7-5x)-(5x+2).(2-3x)
2) (3x2+5x-2).(2x2-4x+3)
3) (3x2+5x-2).(2x2-4x+3)
4)4(2x3+x)-(2x-1)(4x2+3x+1)
5) 2x(x+3)-(x-5).(7+2x)
Nhanh + đúng auto tick :Đ!
Tìm x biết :
a, 4.(18 - 5x) - 12.(3x - 7) = 15.(2x - 16) - 6(x + 14)
b, 5.(3x + 5) - 4.(2x - 3) = 5x + 3.(2x + 12) + 1
c, 2.(5x - 8) - 3.(4x - 5) = 4.(3x - 4) + 11
d, (3x + 2)(2x + 9) - (x + 2)(6x + 1) = (x + 1) - (x - 6)
e, (8x - 3)(3x + 2) - (4x + 7)(x + 4)= (2x + 1)(5x - 1) - 33
Tìm x :a/| 1+2x |- 2x = 1
b/ | 3x-1 |= 1-3x
c / |3x -1 | = |5-2x |
GIÚP MÌNH VỚI ^-^
2.Tìm x biết
a.|2x-5|=x+1
b.|3x-2|-1=2x
c.|x-5|+5=x
d.|3x-5|=3x-5
*Dạng 2: Đa thức BT1: Thực hiện phép tính a) 3x(x^2-5x+7) b) (x+4)(-x^2+6x+5) c) (3x-1)(3x+5)-7(x^2+2) d) (-5x^5 + 2x^4 - 1/3x^3): (-1/2x^3)
