The mantissa of A275 is 5, which cannot be divisible by 8, so when it can be divisible by 9, A+2+7+5=A+ 14 is a multiple of 9.

And 0≤A≤9.

So A=4

275B should be a multiple of 8, so that the product of two numbers can be divisible by 72, and 0≤B≤9.

So B=2.

(2) Enter 65438+ three 0 yuan dollars and one 1/3.

Give 2 yuan fifty-five cents each.

Difference11515000 yuan 1000 yuan.

(3) Let the distance be 1.

The relative velocity is 1/20+ 1/60=4/60.

The second is1/(115) =15s.

(4) The relative speed of running in the same direction is 250-200=50.

A circle is 45*50=2250.

Relative speed of relative operation

250+200=450

Time 2250/450=50 minutes