Các câu hỏi tương tự
Bài 1: tính
\(1^2+2^2+3^2+.....+100^2\)
Bài 2: tìm x
a, x+ (x+1)+ (x+2)+........+(x+2003) = 2004
b, \(2\frac{1}{3}+\left(x-\frac{3}{2}\right)-\left(3-\frac{3}{2}\right)x\)
Tìm x biết
a) (8-5x).(x+2)+4.(x-2).(x+1)+2.(x-2).(x+2)=0
b)\(\left(-\frac{2}{5}+x\right):\frac{7}{9}+\left(-\frac{3}{5}+\frac{5}{6}\right):\frac{7}{9}=0\)
c)\(1+\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{2}{x\left(x+1\right)}=1\frac{2003}{2004}\)
a)orbr{left(frac{1}{2}-1right)}Xleft(frac{1}{3}-1right)X.....Xleft(frac{1}{2002}-1right)Xleft(frac{1}{2003}-1right)b)left(-1frac{1}{2}right)Xleft(-1frac{1}{3}right)X........Xleft(-1frac{1}{2003}right)Xleft(-1frac{1}{2004}right)tính hộ mình nka thanks trc
Đọc tiếp
a)\(\orbr{\left(\frac{1}{2}-1\right)}\)X\(\left(\frac{1}{3}-1\right)\)X.....X\(\left(\frac{1}{2002}-1\right)\)X\(\left(\frac{1}{2003}-1\right)\)
b)\(\left(-1\frac{1}{2}\right)\)X\(\left(-1\frac{1}{3}\right)\)X........X\(\left(-1\frac{1}{2003}\right)\)X\(\left(-1\frac{1}{2004}\right)\)
tính hộ mình nka thanks trc
a) \(\left(\frac{2}{3}x-\frac{4}{9}\right).\left(\frac{1}{2}+\frac{-3}{7}:x\right)=0\)
b) \(\frac{x+5}{2005}+\frac{x+6}{2004}+\frac{x+7}{2003}=-3\)
Tìm x
a/\(\frac{x+7}{2003}+\frac{x+4}{2006}=\frac{x-1}{2011}+\frac{x-5}{2015}\)
b/\(\frac{x-1}{2009}+\frac{x-2}{2008}=\frac{x-3}{2007}+\frac{x-4}{2006}\)
c/\(\frac{3}{\left(x+2\right)\left(x+5\right)}+\frac{5}{\left(x+5\right)\left(x+10\right)}+\frac{7}{\left(x+10\right)\left(x+17\right)}=\frac{x}{\left(x+2\right)\left(x+17\right)}\)
tìm x biết :
\(\left(\frac{x+4}{2000}+1\right)+\left(\frac{x+3}{2001}+1\right)=\left(\frac{x+2}{2002}+1\right)+\left(\frac{x+1}{2003}\right)+1\)
6 tháng 3 2020 lúc 14:49
1.Chứng tỏ rằng:A75.(42004+42003+...+42+4+1)+25 chia hết cho 1002.tính nhanh:Afrac{left(1+2+3+...+99+100right)left(frac{1}{2}-frac{1}{3}-frac{1}{7}-frac{1}{9}right)left(63.1,2-21.3,6right)}{1-2+3-4+...+99-100}Bfrac{left(frac{1}{14}-frac{sqrt{2}}{7}+frac{sqrt[3]{2}}{35}right).left(-frac{4}{15}right)}{left(frac{1}{10}+frac{sqrt[3]{2}}{25}-frac{sqrt{2}}{5}right).frac{5}{7}}3.a)tính giá trị của biểu thức A3x2-2x+1 với |x|frac{1}{2}b)Tìm x nguyên để sqrt{x+1}chia hết cho sqrt{x-3}
Đọc tiếp
1.Chứng tỏ rằng:
A=75.(42004+42003+...+42+4+1)+25 chia hết cho 100
2.tính nhanh:
\(A=\frac{\left(1+2+3+...+99+100\right)\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{7}-\frac{1}{9}\right)\left(63.1,2-21.3,6\right)}{1-2+3-4+...+99-100}\)
\(B=\frac{\left(\frac{1}{14}-\frac{\sqrt{2}}{7}+\frac{\sqrt[3]{2}}{35}\right).\left(-\frac{4}{15}\right)}{\left(\frac{1}{10}+\frac{\sqrt[3]{2}}{25}-\frac{\sqrt{2}}{5}\right).\frac{5}{7}}\)
3.a)tính giá trị của biểu thức A=3x2-2x+1 với |x|=\(\frac{1}{2}\)
b)Tìm x nguyên để \(\sqrt{x+1}\)chia hết cho \(\sqrt{x-3}\)
tìm x
\(\frac{4}{5}x^2\left(\frac{x}{3}-\frac{1}{2}\right)-\left(\frac{1}{2}x-\frac{2}{3}\right)\left(\frac{4x^2}{3}+1\right)=\frac{22}{45}x^2\)
1. Tìm x ϵ Q sao cho:a) (2x-3). (x+1) 0.b) left(x-frac{1}{2}right).left(x+3right)02.Tính:Sfrac{1}{3.5}+frac{1}{5.7}+...+frac{1}{999.1001}3.Tìm x: Biết x không thuộc{-2; -5; -10; -17}frac{3}{left(x+2right).left(x+5right)}+frac{5}{left(x+5right).left(x+10right)}+frac{7}{left(x+10right).left(x+17right)}frac{x}{left(x+2right).left(x+17right)}
Đọc tiếp
1. Tìm x ϵ Q sao cho:
a) (2x-3). (x+1) < 0.
b) \(\left(x-\frac{1}{2}\right).\left(x+3\right)>0\)
2.Tính:
S=\(\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{999.1001}\)
3.Tìm x: Biết x không thuộc{-2; -5; -10; -17}
\(\frac{3}{\left(x+2\right).\left(x+5\right)}+\frac{5}{\left(x+5\right).\left(x+10\right)}+\frac{7}{\left(x+10\right).\left(x+17\right)}=\frac{x}{\left(x+2\right).\left(x+17\right)}\)