Question

1.已知x-5=m²,5-x=n²,且（x-5)a+(5-x)b+2c=3,则c=?

Answer 1

1.x-5=m²,5-x=n² m^2+n^2=0 m=n=0 x=5

（x-5)a+(5-x)b+2c=3

2c=3 c=3/2

2.2x＜a x-1 a>-2