3 17(5) times (8) =(2)(5)(4)00

(4)7(5)0(8) times (3) =( 1)4(2)5(2)4.

Please fill in an appropriate number in each of the above three formulas () to make the formulas valid.

In the following two formulas, different letters represent different numbers, and the same letters represent the same numbers. What numbers do the letters in the formula represent?

1: ABCD times 9=DCBA

A= 1, d = 9 1, 9B does not carry, b = 0 c = 8.

1089*9=980 1

2: abcde times 4=EDCBA

A is an even number, 4A does not carry, and a = 2e = 8.

b！ = 0,4 b+no carry, b is odd, b = 1.

D = 2 or 7, but D is greater than 4, only D = 7.

C=9

Results: 2 1978 * 4 = 879 12.