因式分解7x^2-3y+xy-21x

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因式分解7x^2-3y+xy-21x因式分解7x^2-3y+xy-21x因式分解7x^2-3y+xy-21x7x²-3y+xy-21x=7x²-21x-3y+xy=(7x²

因式分解7x^2-3y+xy-21x
因式分解7x^2-3y+xy-21x

因式分解7x^2-3y+xy-21x
7x²-3y+xy-21x
=7x²-21x-3y+xy
=(7x²-21x)+(xy-3y)
=7x(x-3)+y(x-3)
=(x-3)(7x+y)

7x^2-3y+xy-21x
=(7x^2-21x)+(-3y+xy)
=7x(x-3)+y(x-3)
=(7x+y)(x-3)

7x^2-3y+xy-21x
=(7x^2-21x)+(-3y+xy)
=7x(x-3)+y(x-3)
=(7x-y)(x-3)

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