x+2分之x+3÷(x-2-x+2分之5}
= x+2分之x+3÷(x+2)分之{(x+2)(x-2)-5}
=x+2分之x+3÷(x+2)分之(x^2-4-5)
=x+2分之x+3÷(x+2)分之(x^2-9)
=x+2分之x+3÷(x+2)分之{(x+3(x-3)}
=x+2分之x+3乘以{(x+3(x-3)}分之(x+2)
=(x-3)分之1
当x=-4时
原式=(-4-3)分之1
=-7分之1
x+2分之x+3÷(x-2-x+2分之5}
= x+2分之x+3÷(x+2)分之{(x+2)(x-2)-5}
=x+2分之x+3÷(x+2)分之(x^2-4-5)
=x+2分之x+3÷(x+2)分之(x^2-9)
=x+2分之x+3÷(x+2)分之{(x+3(x-3)}
=x+2分之x+3乘以{(x+3(x-3)}分之(x+2)
=(x-3)分之1
当x=-4时
原式=(-4-3)分之1
=-7分之1