a) \(\frac{\left(x+m\right)}{x-5}+\frac{\left(x+5\right)}{x-m}=2\)
<=> \(\frac{\left(x+m\right)\left(x-m\right)}{\left(x-5\right)\left(x-m\right)}+\frac{\left(x+5\right)\left(x-5\right)}{\left(x-5\right)\left(x-m\right)}=2\)
<=>\(\frac{\left(x+m\right)\left(x-m\right)+\left(x+5\right)\left(x-5\right)}{\left(x-5\right)\left(x-m\right)}=2\)
<=>\(\frac{x^2-m^2+x^2-5^2}{\left(x-m\right)\left(x-5\right)}=2\)
<=>2(x-m)(x-5)=2x2-m2-25
Thay m=2, ta có:
2(x-2)(x-5)=2x2-22-25
2x2-14x+20=2x2-29
20+29=2x2-2x2+14x
49=14x
=>x=3,5
Các câu sau cũng tương tự, dài quá không hi