1) \(-4\left(-x+5\right)+9x-1=4x+7-2x+3\)
\(\Leftrightarrow4x-20+9x-1=2x+10\)
\(\Leftrightarrow9x=31\)
\(\Leftrightarrow x=\frac{31}{9}\)
2) \(9x-3\left(2x+1\right)+3x-3=3x\)
\(\Leftrightarrow9x-6x-3-3=0\)
\(\Leftrightarrow3x=6\)
\(\Leftrightarrow x=2\)
Bai1: Thực hiện phép nhân:
a) 3xy(4xy^2-5x^2y-4xy)
b) (2x-1)(4x^2+2x+1)
c)(3x+2)(9x^2-6x+4)
Bài 2: Tìm x biết
a) (15x-5)(4x-1)+(3x-7)(1-16x)=81
b) (3x-2)(2x-3)-x(6x-4)=11
c) (2x^2-5)(x+1)-(2x-1)(x^2-3)-3x^2=6
d) (2x-1)(3x-1)-(2x-3)(9x-1)=0
Bài 3: a) Cho a+b+c=2P
Chứng minh rằng: 2bc+b^2+c^2-a^2=4P(P-a)
b) Cho M=(x-a)(x-b)+(x-b)(x-c)+(x-c)+(x-a)+x^2
Tính M theo a,b,c biết x=1/2a+1/2b+1/2v
a) 3x (12x - 4) - 9x (4x - 3) = 30;
b) x (5 - 2x) + 2x (x - 1) = 15.
Tìm x:
a,(x+2).(x+3)-(x-2).(x+5)=6
b,3.(2x-1).(3x-1)-(2x-3).(9x-1)=0
c,5x-3{4x-2[4x-3.(5x-2)]}=182
1/ Thực hiện phép nhân :
a) x2 ( 5x3 - x - \(\dfrac{1}{2}\))
b) ( 3xy - x2 + y ) \(\dfrac{2}{3}\)x2y
c) x2 ( 4x3 - 5xy + 2x ) ( -\(\dfrac{1}{2}\) xy )
2/ Tìm x, biết
a) 3x( 12x - 4 ) - 9x (4x - 3 ) = 30
b ) x( 5 - 2x ) + 2x ( x - 1 )= 15
Tìm x,biết:
a,3x(12x-4)-9x(4x-3)=30
b,x(5-2x)+2x(x-1)=15
Tìm x:
1/ 4.(18-5x)-12.(3x-7)=15.(2x-16)-6.(x+14) 2/5.(3x+5)-4(2x-3)=5x+3.(2x+12)+1 3/2.(5x-8)-3(4x-5)=4(3x-4)+11 4/5x-3.{4x-2.[4x-3(5x-2)]}=182Tìm x bt
1) 3.(2x−1).(3x−1)−(2x−3).(9x−1)−3=−3
2) 3x−1.(2x+7)−x+1.(6x−5)=x+2−(x−5)
3) 3xy.(x+y)−(x+y).(x2+y2+2xy)+y3=27
4) 5.x+1.(1−x).(2x2+3)=0
giúp mk vs mai mk đi hk rù
Tìm X :
A) x.(x-2)-(x+3).x+7+9x=6
B)(3x-5).(7-5x)-(5x+2).(2-3x)=4
C)(x+2).(x mũ2 -2x+4)-(x.3+3)=14x
D)(x mũ2 -x+1).(x+1)-x mũ3 -3x=2
GẤP MN HỘ E ...!!🙂😣
Tìm x bt
1) 3.(2x−1).(3x−1)−(2x−3).(9x−1)−3=−3−3
2) 3x−1.(2x+7)−x+1.(6x−5)=x+2−(x−5)
3) 3xy.(x+y)−(x+y).(x2+y2+2xy)+y3=27
4) 5.x+1.(1−x).(2x2+3)=0
giúp mk vs mai mk đi hk rùi
