a) \(3x.\left(2-8x\right)-12x.\left(1-2x\right)=6\)
\(\Rightarrow6x-24x^2-12x+24x^2=6\)
\(\Rightarrow-6x=6\)
\(\Rightarrow x=6:\left(-6\right)=-1\)
b) \(3.\left(3-2x^2\right)+3x.\left(2x-1\right)=9\)
\(\Rightarrow9-6x^2+6x^2-3x=9\)
\(\Rightarrow-3x=9-9=0\)
\(\Rightarrow x=0:\left(-3\right)=0\)
P/s: Ko chắc!
BT3/6. Tìm x, biết
a/ 2x(12x-5)-8x(3x-1)=30
b/3x(3-2x)+6x(x-1)=15
a, 2x(12x-5)-8x(3x-1)=30
b,3x(3-2x)=6x(x-1)=15
tìm x, biết:
a, 2x(12x-5)-8x(3x-1)=30
b, 3x(3-2x)+6x(x-1)=15.
2x(12x-5)-8x(3x-1)=30
3x(3-2x)+6x(x-1)=15
Tìm x
a) (3x+1)(4x-2)-12x(x-3)=5
b) (2x+1)(4x-2)-(8x+2)(x+5)=4
Bài 3:Tìm x
a,2x(12x-5)-8x(3x-1)=30
b,3x(3-2x)+6x(x-1)=15
Bài 4:Chứng minh biểu thức sau ko phụ thuộc biến
x(3x+12)-(7x-20)-x2(2x+3)+x(2x2-5)
Bài 5:Tính giá trị biểu thức
A=x5-70x4-70x3-70x2-70x+34 tại x=71
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
a) 3x (12x - 4) - 9x (4x - 3) = 30;
b) x (5 - 2x) + 2x (x - 1) = 15.
Rút gọn:
\(A=\left(\dfrac{1+2x}{4+2x}-\dfrac{x}{3x-6}+\dfrac{2x^2}{12-3x^2}\right)\cdot\dfrac{24-12x}{6+13x}\)
