-a⁴+16=,4xy-4x²y-y³=因式分解
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-a⁴+16=,4xy-4x²y-y³=因式分解
-a⁴+16=,4xy-4x²y-y³=
因式分解
-a⁴+16=,4xy-4x²y-y³=因式分解
-a⁴+16=(4-a²)(4+a²)=(2-a)(2+a)(4+a²);
4xy-4x²y-y³=y(4x-4x²-y²)