Các câu hỏi tương tự
Cho 2 bieu thuc :
A=\(\dfrac{x-3}{x+2}va\) B= \(\dfrac{3}{x+3}+\dfrac{2}{x-3}-\dfrac{3x-9}{x^2-9}\left(x-2,x\ne3x\ne-3\right)\)
a, Tinh gia tri bieu thuc A khi x=5
b, Chung minh : B=\(\dfrac{2}{x-3}\)
c, Biet C = A.B, Tim x de c = \(\dfrac{-1}{3}\)
Biet a+b=5 va ab=2. Tinh (a-b)2
cho 2 bieu thuc A=x+x^2/2-x va B=2x/x+1+3/x-2-2x^2+1/x^2-x-2 a, tinh gia tri cua A khi /2x-3/=1 b,tim dieu kien xac dinh va rut gon bieu thuc B c,tim so nguyen x de P=A.B dat gia tri lon nhat
mk dang can gap
Tinh a*b biet a+b= -0,75 va 2*x=-3*y
Cho a+b=9 va a.b=20 tinh (a-b)2015=?
Tinh gia tri cua bieu thuc a^4+b^4+c^4,biet rang a+b+c=0 va:
a^2+b^2+c^2=2
chung minh ( a+b)2 = ( a-b)2 + 4ab
b) tinh ( a-b)2015 biet a+b = 9, ab= 20 va a<b
cho ab la hai so tu nhien biet ,a chia 4 du 2,b chia 4 du 2.tinh a va b chia 4 thi du bao nhieu
1) CMR \(\frac{X^{32}+X^{16}+1}{X^2+X+1}\)= \(\left(X^2-X+1\right)\left(X^4-X^2+1\right)\left(X^8-X^4+1\right)\left(X^{16}-X^8+1\right)\)
2)\(Tinh\left(a-b\right)^{2017}Biet\left(a+b\right)=7;a.b=12\)(a<b)