a的四次方+16b的四次方
= a的四次方+16b的四次方+4a二次方b二次方-4a二次方b二次方
=（a二次方+2b二次方）二次方-（2ab）二次方
=（a二次方+2b二次方-2ab)（a二次方+2b二次方+2ab)
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