\(\dfrac{56^3+44^3}{100}-14.56\)
\(=\dfrac{\left(56+44\right)\left(56^2-56.44+44^2\right)}{100}-14.56\)
\(=\dfrac{100.\left(56^2-56.44+44^2\right)}{100}-14.56\)
\(=\)\(56^2-44.56+44^2-14.56\)
\(=\left(56^2-14.56\right)-\left(44.56-44^2\right)\)
\(=56\left(56-14\right)-44\left(56-44\right)\)
tìm x biết
a, ( x + 5 )2 - ( x - 3 )2 = 2x - 7
b, ( 2x - 3 ) . ( 4x2 + 6x + 9 ) = 98
c, ( \(\dfrac{1}{9}\)x2 + \(\dfrac{2}{3}\)x + 4 ) . ( \(\dfrac{1}{3}\)x - 2 ) = 56
d, 16x3 - 12x2 + 3x - 7 = 0
Tính nhanh :
a) \(A=\dfrac{2004^3+1}{2004^2-2003}\)
b) \(B=\dfrac{2005^3-1}{2005^2+2006}\)
Tính nhanh: E=\(\dfrac{2016^3-1}{2016^2+2017}\)
Tìm x, sao cho:
a. \(\dfrac{5}{2x-1}>0\)
b.\(\dfrac{x-1}{2x^2+3}>0\)
c.\(\dfrac{x-2}{x+3}>0\)
d.\(\dfrac{5x^2+1}{x-3}< 0\)
MÌNH ĐANG CẦN GẤP TRONG HÔM NAY, AI LÀM NHANH THÌ MÌNH TICK
giải pt sau
g) 11+8x-3=5x-3+x
h)4-2x+15=9x+4-2x
g)\(\dfrac{3x+2}{2}-\dfrac{3x+1}{6}=\dfrac{5}{3}+2x\)
h)\(\dfrac{x+4}{5}-x+4=\dfrac{4x+2}{5}-5\)
i)\(\dfrac{4x+3}{5}-\dfrac{6x-2}{7}=\dfrac{5x+4}{3}+3\)
k) \(\dfrac{5x+2}{6}-\dfrac{8x-1}{3}=\dfrac{4x+2}{5}-5\)
m) \(\dfrac{2x-1}{5}-\dfrac{x-2}{3}=\dfrac{xx+7}{15}\)
n)\(\dfrac{1}{4}\left(x+3\right)=3-\dfrac{1}{2}\left(x+1\right)-\dfrac{1}{3}\left(x+2\right)\)
p)\(\dfrac{x}{3}-\dfrac{2x+1}{6}=\dfrac{x}{6}-x\)
q)\(\dfrac{2+x}{5}-0,5x=\dfrac{1-2x}{4}+0,25\)
Tính
\(S=\dfrac{1}{2}\left(1+2\right)+\dfrac{1}{3}\left(1+2+3\right)+\dfrac{1}{4}\left(1+2+3+4\right)+...+\dfrac{1}{2013}\left(1+2+3+...+2013\right)+\dfrac{1}{2014}\left(1+2+3+...+2014\right)\)
giải pt
a.\(\dfrac{3x-1}{x-1}-\dfrac{2x+5}{x+3}=1-\dfrac{4}{\left(x-1\right)\left(x+3\right)}\)
b. \(\dfrac{13}{\left(x-3\right)\left(2x+7\right)}+\dfrac{1}{2x+7}=\dfrac{6}{\left(x-3\right)\left(x+3\right)}\)
a. \(\dfrac{x-1}{x^{2^{ }}-4}=\dfrac{3}{2-x}\)
b. \(\dfrac{1}{x-1}-\dfrac{7}{x-2}=\dfrac{1}{\left(x-1\right)\left(2-x\right)}\)
c. \(\dfrac{2x+3}{2x-3}-\dfrac{3}{4x-6}=\dfrac{2}{5}\)
d. \(\dfrac{x+29}{31}-\dfrac{x+27}{33}=\dfrac{x+17}{43}-\dfrac{x+15}{45}\)
giải phương trình
\(\dfrac{x^3-\left(x-1\right)^3}{\left(4x+3\right)\left(x-5\right)}=\dfrac{7x-1}{4x+3}-\dfrac{x}{x-5}\)
