(u-2v)÷(u+2v)-2÷(u²-4v²)
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(u-2v)÷(u+2v)-2÷(u²-4v²)(u-2v)÷(u+2v)-2÷(u²-4v²)(u-2v)÷(u+2v)-2÷(u²-4v²
(u-2v)÷(u+2v)-2÷(u²-4v²)
(u-2v)÷(u+2v)-2÷(u²-4v²)
(u-2v)÷(u+2v)-2÷(u²-4v²)
原式=(u-2v)²/(u²-4v²)-2/(u²-4v²)
=(u²-4uv+4v²-2)/(u²-4v²)
(u²-4uv+4v²-2 )/(u²-4v²)