\(=6-3x+x^2-4x+4\)
\(=x^2-7x+10\)
\(=x^2-2x-5x+10\)
\(=x\left(x-2\right)-5\left(x-2\right)\)
\(=\left(x-2\right)\left(x-5\right)\)
B1:tìm x biết a, (-2+x^2)(x^2-2)(x^2-2)(x^2-2)(x^2-2)=1 b, (2x+3)(x-4)+(x-5)(x-2)=(3x-5)(x-4) c,(8x-3)(3x+2)-(4x+7)(x+4)=(4x+1)(5x-1) d, 2x^2+3(x-1)(x+1)=5x(x+1) e, (8-5x)(x+2)+4(x-2)(x+1)=(2+x)(2-x) f, 4(x-1)(x+5)-(x+2)(x+5)=3(x-1)(x+2)
Bài 1:
a, (-2+x\(^2\))(x\(^2\)-2)(x\(^2\)-2)(x\(^2\)-2)(x\(^2\)-2)=1
b, (2x+3)(x-4)+(x-5)(x-2)=(3x-5)(x-4)
c, (8x-3)(3x+2)-(4x+7)(x+4)=(4x+1)(5x-1)
d,2x\(^2\)+3(x-1)(x+1)=5x(x+1)
e,(8-5x)(x+2)+4(x-2)(x+1)=(2+x)(2-x)
f, 4(x-1)(x+5)-(x+2)(x+5)=3(x-1)(x+2)
1)x^2.(2x^3-x^2+4x) 2)(x+2).(5x^3-3x^2+x) 3)(x^2-2).(x^2+2x-1) 4)(x^2+x+1).(x-1)
.A) x/x+1=1/2 , B) x/2=x/3 , C) x+1/2=x+1/2017, i)3/x=x/2017 , O) x:3=x+1/2 , m) x+1/2=x+2/3 ,P) x+1/2=x , M) 2/x=x/8 , Q) x2/2=8/x2 , r) x3/2=32/x
2 (x-3).(x^2+3x+9)-(x+3)^2
3 (2x-1)^2 +2x^2.(x-2).(x+3)^2
tìm x
a) 5x(x-3)(x+3)-(2x-3)^2- 5(x+2)^2 +34x(x+2)=1
b) (x-2)^3+ 6(x+1)^2 - (x-3)(x^2+3x+9)=97
Cho đa thức B(x) = 2\(x^{^{ }2}\)-4x + 3. Tính B(3), B(-\(\dfrac{1}{2}\) )
Cho đa thức M(x) = 7\(x^3\)- 3\(x^4\)- \(x^2\) + 3\(x^2\)- \(x^3\)- 3\(x^4\)- 6\(x^3\)
Cho đa thức N(x) = 3x - 5\(x^3\) + 8\(x^2\)- 5x + 5\(x^3\) + 5
Tìm x biết
a) 27< 3\(^x\) < 243
b) 2\(^x\) + 2\(^{x+1}\) + 2\(^{x+1}\) + 2\(^{x+2}\) =56
c) 3\(^x\) + 3\(^{x+2}\) =810
