\(a,\left(x+2\right)^2-\left(x-2\right)^2-2\left(x-2\right)\left(x+2\right).\)
\(=\left(x+2-x+2\right)^2=4^2=16\)
\(b,\left(x-y\right)^2+\left(x+y\right)^2+2\left(x-y\right)\left(x+y\right)\)
\(=\left(x-y+x+y\right)^2=x^2\)
\(c,\left(x-y+z\right)^2-2\left(x+y\right)-2\left(x+y\right)\left(x-y\right)-z^2\)
Rút gọn biểu thức
a,(x+y)2-(x-y)2
b,(x-y-z)2+(x+y+z)2
c,(x+y)2-2(x+y)(x-y)+(x-y)2
Rút gọn:
a) A=(5-x)(5+x)-x(4-x)-25
b) B=(x2+1)(x+1)-(x+1)3
c) C=(x+y-2)2-2(x+y-2)(y+x)+(x+y)2
Rút gọn:
a) \(\dfrac{3\left(x-y\right)\left(x-z\right)^2}{6\left(x-y\right)\left(x-z\right)}\)
b) \(\dfrac{6x^2y^2}{8xy^5}\)
c) \(\dfrac{3x\left(1-x\right)}{2\left(x-1\right)}\)
d) \(\dfrac{9-\left(x+5\right)^2}{x^2+4x+4}\)
e) \(\dfrac{x^2-2x+1}{x^2-1}\)
f) \(\dfrac{8x-4}{8x^3-1}\)
g) \(\dfrac{x^2+5x+6}{x^2+4x+4}\)
k) \(\dfrac{20x^2-45}{\left(2x+3\right)^2}\)
Rút gọn biểu thức:
a) (x-2)^3-x(x+1)(x-1)+6x(x-3)
b) (2x+y)(4x^2-2xy+y^2)-(2x-y)(4x^2+2xy+y^2)
c) (x+y+z)^2-2(x+y+z)(x+y)+(x+y)
giúp mình vs!!!!
I, a Cho x^2+y^2=2 CMR 2(x+1)(y+1) chia hết cho (x+y)(x+y+2).
b Cho (x+y)(x+z)+(y+z)(y+x)=2(z+x)(z+y). CMR z^2= (x^2+y^2) : 2
Ai làm được mk hứa sẽ tick. Cảm ơn trước nha!!!!
1) Rút gọn biểu thức sau :
a) (x+y)2+(x-y)2
b) 2(x-y)(x+y)+(x+y)2+(x-y)2
c)(x-y+z)2+(z-y)2+2(x-y+z)(y-z)
rút gọn
a) ( x-1) 2 + z ( x-z ) (x+z) ( x-z ) 2
b) ( x-y ) 2 + ( x-y ) (x+y) + ( x+y ) 2
Rút gọn các phân thức sau: a) x^3+y^3+z^3-3xyz/(x-y)^2+(x-z)^2+(y-z)^2 b) (x^2-y^2)^3+(y^2-z^2)^3+(z^2-x^2)^3/(x-y)^3+(y-z)^3+(z-x)3
rút gọn biểu thức:
a) (x+y)2+(x-y)2
b) 2.(x-y).(x+y)+(x+y)2+(x-y)2
c) (x-y+z)2+(z-y)2+2.(x-y+z).(y-z)
