通分a/a^2+2a+1,2/3a+6 填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( ) 急.

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通分a/a^2+2a+1,2/3a+6填空-5/7x=()/7x=5/()x-y/x+y=X^2-y^2/()急.通分a/a^2+2a+1,2/3a+6填空-5/7x=()/7x=5/()x-y/x+

通分a/a^2+2a+1,2/3a+6 填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( ) 急.
通分a/a^2+2a+1,2/3a+6 填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( ) 急.

通分a/a^2+2a+1,2/3a+6 填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( ) 急.
1.1+2a^2+a/a
2.第一个不会,第二空-7x
3.(x+y)^2