Question

1.甲、乙两地相距s千米,某人从甲地出发,计划用t小时到达乙地.若要提前2小时到达,那么每小时需多走多少千米?

Answer 1

1.s/(t-2)-s/t

2.x^2-3x+2-(y-3)/x ->y=3

y^2+2y+1=(y+1)^2=16