Violympic toán 7
Các câu hỏi tương tự
Tìm x biết: \(\left(1-\dfrac{52}{53}\right)+\left(\dfrac{105}{106}-1\right)+\left(\dfrac{158}{159}-1\right)=\dfrac{\left|x\right|}{318}\)
\(\dfrac{3}{\left(x-4\right).\left(x-7\right)}+\dfrac{6}{\left(x-7\right).\left(x-13\right)}+\dfrac{15}{\left(x-13\right).\left(x-28\right)}-\dfrac{1}{x-28}=\dfrac{-5}{2}\)
Tìm x: \(\frac{3}{\left(x-4\right)\left(x-7\right)}+\frac{6}{\left(x-7\right)\left(x-13\right)}+\frac{15}{\left(x-13\right)\left(x-28\right)}+\frac{1}{x-28}=\frac{-1}{20}\)
Tìm x.
\(1,\dfrac{3}{2}\left(x-\dfrac{1}{3}\right)-\dfrac{1}{2}\left(x+\dfrac{1}{2}\right)=\dfrac{1}{4}\)
\(2,3\left(x-2\right)-4\left(x+2\right)=x+2\)
\(3,4x\left(x-1\right)+4x-2\left(x+1\right)=-2\)
\(4,x\left(x+2\right)-3\left(x-1\right)=3\left(x+1\right)\)
Tìm x,y\(\in\)N biết
\(\left(2^x+1\right)\left(2^x+2\right)\left(2^x+3\right)\left(2^x+4\right)-15^y=1679\)
Tìm x:
\(3\left|x+4\right|-\left|2x+1\right|-5\left|x+3\right|+\left|x-9=5\right|\)
\(\left|x-2\right|+\left|x-3\right|+\left|2x-8\right|=9\\ \left|x+2\right|+\left|x+3\right|+\left|x+1\right|=4\\ \left|x+\dfrac{1}{1.5}\right|+\left|x+\dfrac{1}{5.9}\right|+\left|x+\dfrac{1}{9.13}\right|+...+\left|x+\dfrac{1}{397.401}\right|=101x\)
Tìm x biết :
\(\left(x^2-20\right)\left(x^2-15\right)\left(x^2-10\right)\left(x^2-5\right)< 0\)
tìm x,y biết:
a)left|x+dfrac{4}{15}right|-left|3,75right|-left|-2,15right|
b) left|dfrac{1}{2}-dfrac{1}{3}+xright|-dfrac{1}{4}-left(yright)
c)left|x-yright|+left|y+dfrac{9}{25}right|0
d)left|x-dfrac{3}{5}right| dfrac{1}{3}
e)left|x+dfrac{11}{2}right|left|-5,5right|
Đọc tiếp
tìm x,y biết:
a)\(\left|x+\dfrac{4}{15}\right|-\left|3,75\right|=-\left|-2,15\right|\)
b) \(\left|\dfrac{1}{2}-\dfrac{1}{3}+x\right|=-\dfrac{1}{4}-\left(y\right)\)
c)\(\left|x-y\right|+\left|y+\dfrac{9}{25}\right|=0\)
d)\(\left|x-\dfrac{3}{5}\right|< \dfrac{1}{3}\)
e)\(\left|x+\dfrac{11}{2}\right|>\left|-5,5\right|\)
1) Cho đa thức \(f\left(x\right)=x^{14}-14.x^{13}+14.x^{12}-...+13.x^2-14.x+14\) Tính f(13)
2) Tính : \(\left(\dfrac{3}{4}-81\right)\left(\dfrac{3^2}{5}-81\right)\left(\dfrac{3^3}{6}-81\right)...\left(\dfrac{3^{2000}}{2003}-81\right)\)