Ask a math problem of the joint entrance examination for management majors. - Training Enrollment Network

Ask a math problem of the joint entrance examination for management majors.

What's the problem? What is X Y?

Factorization 8x2+10xy-3y2 = (4x-y) (2x+3y)

4x-y=7n

Y=4x-7n

2x+3y = 2x+ 12y-2 1n = 14y-2 1n = 7(2y-3n)，

So 2x+3y is also a multiple of 7.

So (4x-y)(2x+3y) is a multiple of 49.

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