A math problem "can you tell me how to calculate it?"

The correct answer is 12345679*8=98765432.

That is to say, P= 1, A=2, B=3, C=4, D=5, E=6, F=7, G=9 and Q=8.

The specific reasons are as follows:

Because it is still 8 digits after multiplication, P= 1 can be determined.

Because P= 1, G=8 or 9, but when G=8, A equals 4, which is unqualified, so G=8.

Because G=8 and A=2.

Because A=2, in order for A to carry only 1, Q must be between 6 and 9, that is, B is 0-3.

Because B is 0-3 and G=9, F can only be one of (2, 7, 3, 8). If F=2 or 7, B = 3；; If F=3 or 8, B= 1, conversely, b can only be 1 or 3, because p is already = 1, so b can only be =3, and f can only be =7.

Then multiply it by 4, 5, 6, 8, 0, and it is easy to deduce that C=4, D=5 and E=6, so the final result is 12345679*8=98765432.