A. congratulations, right!Your numerical reasoning ability is very strong!

B. it's a pity, you answer wrong.Analysis of this problem are as follows: M is greater than 1, less than 10 M x A, therefore, if A is not 1, M and A is A pair of two pairs of Numbers below: (1) or (2) 2 and 4 2 and 3.In M and A generation into the formula of the figures, we seek the value of the F number makes M x F the bottom is A.In order to seek appropriate F value, we still have to seek the value of E, so that when the M * E plus carry digital bottom for F.So gradually, we will find that: in the case of (1), when M = 2, D will not have the right number, but when M = 4, D or E does not have a suitable numerical;In the case of (2), when M = 2, F there won't be the right values, but when M = 3, A suitable multiplication formula, and the reasoning is assumed not 1 A.If A is 1 M and F is A 7 another is 3.When M is 7, E and F are 3;But when M is 3, is there A another suitable multiplication formula, so whether A is 1, M to 3.(Psychological tests /test/)

C. it's a pity, you answer wrong.Analysis of this problem are as follows: M is greater than 1, less than 10 M x A, therefore, if A is not 1, M and A is A pair of two pairs of Numbers below: (1) or (2) 2 and 4 2 and 3.In M and A generation into the formula of the figures, we seek the value of the F number makes M x F the bottom is A.In order to seek appropriate F value, we still have to seek the value of E, so that when the M * E plus carry digital bottom for F.So gradually, we will find that: in the case of (1), when M = 2, D will not have the right number, but when M = 4, D or E does not have a suitable numerical;In the case of (2), when M = 2, F there won't be the right values, but when M = 3, A suitable multiplication formula, and the reasoning is assumed not 1 A.If A is 1 M and F is A 7 another is 3.When M is 7, E and F are 3;But when M is 3, is there A another suitable multiplication formula, so whether A is 1, M to 3.