(7x+3x^2)除以(2x+1)*(6x+3)除以(7x+3) 帮下忙

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(7x+3x^2)除以(2x+1)*(6x+3)除以(7x+3) 帮下忙
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(7x+3x^2)除以(2x+1)*(6x+3)除以(7x+3) 帮下忙
(7x+3x^2)除以(2x+1)*(6x+3)除以(7x+3) 帮下忙

(7x+3x^2)除以(2x+1)*(6x+3)除以(7x+3) 帮下忙
(7x+3x^2)除以(2x+1)*(6x+3)除以(7x+3)
=(7x+3x^2)/(2x+1)*(6x+3)/(7x+3)
=x(7+3x)/(2x+1)*(3(2x+1)/(7x+3))
=3x(7+3x)/(7x+3)