Thực hiện phép tính: x 2 + 6 x + 9 1 - x . x - 1 3 2 x + 3 3
Thực hiện phép tính.
a) x^2 - 9 / 2x + 6 : 3-x / 2
b) 2x / x- y - 2y / x - y ( với y khác x)
\(a,=\dfrac{\left(x-3\right)\left(x+3\right)}{2\left(x+3\right)}\cdot\dfrac{2}{-\left(x-3\right)}=\dfrac{x-3}{2}\cdot\dfrac{2}{-\left(x-3\right)}=-1\\ b,=\dfrac{2x-2y}{x-y}=\dfrac{2\left(x-y\right)}{\left(x-y\right)}=2\)
a,\(\dfrac{x^2-9}{2x+6}:\dfrac{3-x}{2}=\dfrac{\left(x-3\right)\left(x+3\right)}{2\left(x+3\right)}.\dfrac{2}{3-x}=\dfrac{x-3}{3-x}=\dfrac{-\left(3-x\right)}{3-x}=-1\)
b, \(\dfrac{2x}{x-y}-\dfrac{2y}{x-y}=\dfrac{2x-2y}{x-y}=\dfrac{2\left(x-y\right)}{x-y}=2\)
thực hiện phép tính
a, \(\dfrac{x^2}{3x+6}+\dfrac{4x+4}{3x+6}\)
b, \(\dfrac{x+3}{x}+\dfrac{x}{3-x}-\dfrac{9}{3x-x^2}\)
a: \(\dfrac{x^2}{3x+6}+\dfrac{4x+4}{3x+6}=\dfrac{x^2+4x+4}{3x+6}=\dfrac{x+2}{3}\)
b: \(\dfrac{x+3}{x}+\dfrac{x}{3-x}-\dfrac{9}{3x-x^2}\)
\(=\dfrac{x^2-9-x^2+9}{x\left(x-3\right)}\)
=0
Thực hiện phép tính :
Thực hiện phép tính :
3 6 - x
_____ + ________
2x+6 2x^2 + 6x
\(=\dfrac{3}{2\left(x+3\right)}+\dfrac{6-x}{2x\left(x+3\right)}=\dfrac{3x+6-x}{2x\left(x+3\right)}=\dfrac{2x+6}{2x\left(x+6\right)}=\dfrac{2\left(x+3\right)}{2x\left(x+3\right)}=\dfrac{1}{x}\)
\(=\dfrac{3x+6-x}{2x\left(x+3\right)}=\dfrac{2x+6}{2x\left(x+3\right)}=\dfrac{1}{x}\)
thực hiện phép tính
\(\dfrac{x}{x-3}-\dfrac{6}{x}-\dfrac{9}{x^2-3x}\)
\(\dfrac{7}{x}-\dfrac{x}{x+6}+\dfrac{36}{x^2+6x}\)
\(\dfrac{6}{x-3}-\dfrac{2x-16}{x^2-9}-\dfrac{4}{x+3}\)
a) Ta có: \(\dfrac{x}{x-3}-\dfrac{6}{x}-\dfrac{9}{x^2-3x}\)
\(=\dfrac{x^2}{x\left(x-3\right)}-\dfrac{6\left(x-3\right)}{x\left(x-3\right)}-\dfrac{9}{x\left(x-3\right)}\)
\(=\dfrac{x^2-6x+18-9}{x\left(x-3\right)}\)
\(=\dfrac{\left(x-3\right)^2}{x\left(x-3\right)}=\dfrac{x-3}{x}\)
b) Ta có: \(\dfrac{7}{x}-\dfrac{x}{x+6}+\dfrac{36}{x^2+6x}\)
\(=\dfrac{7\left(x+6\right)-x^2+36}{x\left(x+6\right)}\)
\(=\dfrac{7x+42-x^2+36}{x\left(x+6\right)}\)
\(=\dfrac{-\left(x^2-7x-78\right)}{x\left(x+6\right)}\)
\(=\dfrac{-\left(x^2-13x+6x-78\right)}{x\left(x+6\right)}\)
\(=\dfrac{-\left[x\left(x-13\right)+6\left(x-13\right)\right]}{x\left(x+6\right)}\)
\(=\dfrac{13-x}{x}\)
c) Ta có: \(\dfrac{6}{x-3}-\dfrac{2x-6}{x^2-9}-\dfrac{4}{x+3}\)
\(=\dfrac{6\left(x+3\right)-2x+6-4\left(x-3\right)}{\left(x-3\right)\left(x+3\right)}\)
\(=\dfrac{6x+18-2x+6-4x+12}{\left(x-3\right)\left(x+3\right)}=\dfrac{36}{\left(x-3\right)\left(x+3\right)}\)
Thực hiện phép tính
2^16 x ( -9)^3 / ( -6)^5 x 16^
Mọi người giúp mik với ;-;
2^16x(-9)^3/(-6)^5x16=98304
nếu ko đúng thì cho mình xin lỗi nhé!
Thực hiện phép tính:
( 21/x2-9 - x-4/3-x - x-1/3+x) : ( 1 - 3/x+3 + 2/x2+5x+6)
Thực hiện phép tính
(x-6).(x+6)-2x.(x+6)+(x+6)^2
\(\left(x-6\right)\left(x+6\right)-2x\left(x+6\right)+\left(x+6\right)^2=x^2-36-2x^2-12x+x^2+12x+36=0\)
Ta có: \(\left(x-6\right)\left(x+6\right)-2x\left(x+6\right)+\left(x+6\right)^2\)
\(=x^2-36-2x^2-12x+x^2+12x+36\)
=0
Thực hiện phép tính : 1/x^2+6x+9 + 1/6x-x^2-9 + x/x^2-9
Thực hiện phép tính : 1/x^2+6x+9 + 1/6x-x^2-9 + x/x^2-9
Cứu với mn ơi huhu !!
Thực hiện phép tính:
( 21/x2-9 - x-4/3-x - x-1/3+x) : ( 1 - 3/x+3 + 2/x2+5x+6)
ngu ko bit lm nguuuu đúng là cái loại ngu