(49X^2-9Y^2)÷(7X-3Y)
问题描述:
(49X^2-9Y^2)÷(7X-3Y)
答
49X^2-9Y^2=(7x+3y)(7x-3y)
所以(49X^2-9Y^2)÷(7X-3Y)=(7x+3y)(7x-3y)÷(7X-3Y)=7X+3Y