giúp mình vơi đang cần gấp lắm nhanh mình k
(x - 10) + (x - 9) + (x - 8) + .... + (x - 1) = -2015
=> x - 10 + x - 9 + x - 8 + ... + x - 1 = -2015
=> (x + x + x + ... + x) - (10 + 9 + 8 + ... + 1) = -2015
=> 10x - 55 = -2015
=> 10x = 1960
=> x = 196
Tìm x \(\in Z\)
a,\(\left|2x-1\right|=\left|x+3\right|\)
b,\(\left(x^2-1\right)\left(x^2-20\right)\le0\)
c, \(\left(x+1\right)+\left(x+3\right)+\left(x+5\right)+...+\left(x+2015\right)=0\)
d, \(\left(x-3\right)+\left(x-2\right)+\left(x-1\right)+...+10+11=11\)
Tìm số nguyên x , biết
\(10\) ⋮ \(\left(x-1\right)\)
\(b.\left(x+5\right)\) ⋮ \(\left(x-2\right)\)
c. \(\left(3x+8\right)\) ⋮ \(\left(x-1\right)\)
Tìm x thuộc N biết:
a, \(\left(x-9\right)^4=\left(x-9\right)^7\)
b, \(\left(3x-15\right)^{10}=\left(3x-15\right)^{15}\)
c, \(\left(x-8\right)^3=\left(x-8\right)^6\)
Tìm x thuộc N
\(a,\left(x-9\right)^4=\left(x-9\right)^7\)
\(b,\left(3x-15\right)^{10}=\left(3x-15\right)^{15}\)
\(c,\left(x-8\right)^3=\left(x-8\right)^6\)
câu nò đúng mik sẽ cho 5 tick nhé
Tìm x, biết: \(\frac{-1}{2}.\left(3x+5\right)-\frac{2}{9}.\left(9-6x\right)=\frac{3}{5}.\left(x-10\right)-3\)
Tìm x, biết:
\(\frac{3}{\left(x+2\right)\left(x+5\right)}+\frac{5}{\left(x+5\right)\left(x+10\right)}+\frac{7}{\left(x+10\right)\left(x+17\right)}=\frac{x}{\left(x+2\right)\left(x+17\right)}\left(x\notin-2;-5;-10;-17\right)\)
\(\frac{2}{\left(x-1\right)\left(x-3\right)}+\frac{5}{\left(x-3\right)\left(x-8\right)}+\frac{12}{\left(x-8\right)\left(x-20\right)}-\frac{1}{x-20}=-\frac{3}{4}\)
Với \(x\notin1;3;8;20\)
\(\frac{x+1}{10}+\frac{2+1}{11}\frac{x+1}{12}=\frac{x+1}{13}+\frac{x+1}{14}\)
\(\frac{x-10}{30}+\frac{x-14}{43}+\frac{x-5}{95}+\frac{x-148}{8}=0\)
Tìm x :
\(a,x.\left(5x+10\right)+5.\left(x23+30\right)-9.\left(3x+5\right)=100\)
\(b,10.\left(8x+9x\right)+8.\left(2x-1\right)-2.\left(5-6x\right)=20\)
\(c,\left(x.5^2\right).\left(194+x.20\right)=50\)
Tìm x biết
\((1+X)+\left(2+X\right)+\left(3+X\right)+...+\left(10+X\right)=75\)\(X\div[\left(1800+600\right)\div30]=560\div\left(315-35\right)\)
Tìm x \(\in\)Z ,biết:
a,\(\left(x+1\right)+\left(x+3\right)+...+\left(x+99\right)=0\)
b,\(\left(x-3\right)+\left(x-2\right)+\left(x-1\right)+...+10+11=11\)
