\(14x\left(x+3\right)-7x^2\left(3+x\right)=\left(x+3\right)\left(14x-7x^2\right)=7x\left(2-x\right)\left(x+3\right)\\ \left(2x-5\right)\left(3+4x\right)-4x+10=\left(2x-5\right)\left(3+4x-2\right)=\left(2x-5\right)\left(4x+1\right)\)
1. TÌm x:
a)4x^2-2x+3-4x.(x-5)=7x-3
b)-3x.(x-5)+5.(x-1)+3x^2=4x
c)7x.(x-2)-5.(x-1)=21x^2-14x^2+3
d)3.(5x-1)-x.(x-2)+x^2-13x=7
e) 1/5x.(10x-15)-2x.(x-5)=12
1. TÌm x:
a)4x^2-2x+3-4x.(x-5)=7x-3
b)-3x.(x-5)+5.(x-1)+3x^2=4x
c)7x.(x-2)-5.(x-1)=21x^2-14x^2+3
d)3.(5x-1)-x.(x-2)+x^2-13x=7
e) 1/5x.(10x-15)-2x.(x-5)=12
a)(6x^2+17x+12):(2x+3) b)(5x^2+13x-6):(5x-2) c)(-8x^2+22x-15):(2x-5) d)(14x^2-33x-5):(2x-5) e)(2x^3+7x^2+15x+6):(2x+1) f)(x^3+4x^2-11x-2):(x-2) g)(12x^3+2x^2+4x+3):(2x+1)
Tim X;
a/ 6x.(4x-3) - 8x.(5-3x)=43
b/(1-7x).(4x-3)-(14x-9).(5-2x)=30
c/(x+1).(x+2).(x+5) - x2.(x+8)=27
Dùng phương pháp hệ số bất định
a) 4x^4+4x^3+5x^2+2x+1
b) x^4-7x^3+14x^2-7x+1
Tìm x, biết:
a) 5 ( x2 - 3x + 1 ) + x ( 1 - 5x ) = x - 2
b) 7x ( x - 2 ) - 5 ( x - 1 ) = 21x2 - 14x2 + 3
c) 4x2 - 2x + 3 - 4x ( x - 5 ) = 7x - 3
Ai làm đúng + nhanh nhất mk tk
Chứng minh rằng giá trị của biểu thức ko phụ thuộc vào giá trị biến :
A) ( 4x - 5 )( 2x + 3 ) - 4( x + 2 )( 2x - 1 ) + ( 10x + 7 )
B) ( 7x - 6y )( 4x + 3y ) - 2 (14x + y )( x - 9y ) - 19(13xy- 1)
a) 4x4+4x3 +5x2 +2x+1
b)3x2 +22xy+11x+37y+7y2 +10
c)x4 -7x3 +14x2 -7x+1
d)x4 -8x +63
Bài 1
a) 2x^3 + 5x^2 + 5x + 3
b) 4x^3 + x^2 + x - 3
c) 5x^3 - 12x^2 + 14x - 4
d) 6x^3 - 7x^2 + 5x - 2
e) 3x^3 + 19x^2 + 4x - 12
