x+1 phan x-1
2x+3 phan x-2
2x-1phan x+3
2x+3 phan3x-1
phan tich da thuc thanh phan tu
a,32x^4+1
b,x^8+x+1
c,x^7+x^2+1
b/ \(=x^8-x^7+x^5-x^4+x^2+x^6-x^5+x^3-x^2+1+x^7-x^6+x^4-x^3+x\)
\(=x^2\left(x^6-x^5+x^3-x^2+1\right)+\left(x^2-x^5+x^3-x^2+1\right)+x\left(x^6-x^5+x^3-x^2+1\right)\)
\(=\left(x^6-x^5+x^3-x^2+1\right)\left(x^2+1+x\right)\)
1) - Phan tich cac da thuc sau thanh nhan tu :
a) 14x2y2 - 21xy2 + 28x2y d) 2 phan 7 x(3y -1 )-2 phan 7y (3y-1)
b) x3 -3x2 + 3x- 1 e) (x+y)2-4x2
c) 27x2+1phan 8 f) (x+y)3-(x-y)3
2) tim x biet
a) x2(x+1)+2x(x+1)=0 b) x(3x-2)-5(2-3x)=0
c) 4 phan 9 -25x2=0 d) x2-x+phan4=0
3) tinh nhanh cac gia tri bieu thuc sau :
a) 17.91,5+170.0,85 b) 20162-162
c) x(x-10-y(1-x)tai x=2001va y = 2999
2.a là x=0 , x=-1, x=-2
2.b là x=2/3 , x=-5
so tu nhien xy thoa man x phan 5 - 4 phan y=1phan 3
1- 1 phan 2 - 1 phan 2 ^2 - 1phan 2^3 - 1phan 2^4-....- 1phan 2^10 .> 1phan 2^11
(1phan 2x4+1 phan 4x6+1 phan 6x8+1phan 8x10)xy 1phan 3
Giải các phương trình sau:
a) 3 x − 2 x + 1 = 0 ; b) x 2 + 2 2 x − 1 = 0 ;
c) x + 3 2 x + 3 x − 5 = 0 ; d) x + 7 x + 6 2 − 4 x 3 = 0
phan tich da thuc sau thanh nhan tu
a x^3-9x^2+15x+25
b x^3-4x^2-11x+30
c 2x^4+x^3-22x^2+15x-36
1 phần 3-x - 1 phan 3+x >0
-3x +4 phan 2x-3 < -2
giup mk vs
Tinh
1phan 2 +1 phan 3 + 1 phan 6
\(\frac{1}{2}+\frac{1}{3}+\frac{1}{6}=\frac{3+2+1}{6}=\frac{6}{6}=1\)
\(\frac{1}{2}+\frac{1}{3}+\frac{1}{6}=\frac{3}{6}+\frac{2}{6}+\frac{1}{6}=\frac{6}{6}=1\)
\(\frac{1}{2}\)+\(\frac{1}{3}\)+\(\frac{1}{6}\)=\(\frac{3}{6}\)+\(\frac{2}{6}\)+\(\frac{1}{6}\)=\(\frac{5}{6}\)+\(\frac{1}{6}\)=\(\frac{6}{6}\)=1