Giải pt $\frac{2}{x^2+4x+3}$ +$\frac{5}{x^2+11x+24}$ +$\frac{2}{x^2+18x+80}$ =$\frac{9}{52}$ 20/09/2021 Bởi Jasmine Giải pt $\frac{2}{x^2+4x+3}$ +$\frac{5}{x^2+11x+24}$ +$\frac{2}{x^2+18x+80}$ =$\frac{9}{52}$
2/x^2+4x+3+5/x^2+11x+24+2/x^2+18x+80=9/52 <=>1/x+1-1/x+3+1/x+3-1/x+8+1/x+8-1/x+10=9/52 <=>1/x+1-1/x+10=9/52 <=>9/x^2+11x+10=9/52 <=>x^2+11x+10=52 <=>x^2+11x-42=0 <=>(x-3)(x+14)=0 <=>x-3=0 hoặc x+14=0 <=>x=3 hoặc x=-14 Bình luận
2/x^2+4x+3+5/x^2+11x+24+2/x^2+18x+80=9/52
<=>1/x+1-1/x+3+1/x+3-1/x+8+1/x+8-1/x+10=9/52
<=>1/x+1-1/x+10=9/52
<=>9/x^2+11x+10=9/52
<=>x^2+11x+10=52
<=>x^2+11x-42=0
<=>(x-3)(x+14)=0
<=>x-3=0 hoặc x+14=0
<=>x=3 hoặc x=-14