Tìm x, biết:
a) \(\frac{x+1}{5}\)+ \(\frac{x+3}{4}\)= \(\frac{x+5}{3}\)+ \(\frac{x+7}{2}\)
b) \(\frac{3}{\left(x+2\right)\left(x+5\right)}\)+ \(\frac{5}{\left(x+5\right)\left(x+10\right)}\)+ \(\frac{7}{\left(x+10\right)\left(x+17\right)}\)= \(\frac{x}{\left(x+2\right)\left(x+17\right)}\)
Giúp mk với nha!!!
a)\(\frac{x+1}{5}+\frac{x+3}{4}=\frac{x+5}{3}+\frac{x+7}{2}\)
\(\Leftrightarrow\frac{12\left(x+1\right)}{60}+\frac{15\left(x+3\right)}{60}=\frac{20\left(x+5\right)}{60}+\frac{30\left(x+7\right)}{60}\)
\(\Leftrightarrow12x+12+15x+45=20x+100+30x+210\)
\(\Leftrightarrow27x+57=50x+310\)
\(\Leftrightarrow27x+57-50x-310=0\)
\(\Leftrightarrow-23x-253=0\)
\(\Leftrightarrow x=-\frac{253}{23}\)
b)Tự làm
