Two math problems in junior high school final exam (ok, add 20)

1.( 1) let x=0, then a=- 1(2) let x= 1, then a+b+c+d= 1, then A-

2. The speed of A is 1.45 times that of B, that is, 4.35 km/h. Let's assume that A walked t hours to reach its destination.

The total length calculated by A is 4,35 * t, Otsuichi * * * walked t+0.5 hours to the destination, and the total length calculated by B is 35*t (t+0.5).

So 4.35*t=3*(t+0.5), and the solution is t =1.11hour, so the total length is1.1.

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