✨ Best Answer ✨
x＋y＋z＝kとおくと
与式＝
k＾2
＋(k－2z)＾2
＋(k－2x)＾2
＋(k－2y)＾2
＝4(k＾2－k(x＋y＋z)＋x＾2＋y＾2＋z＾2)
＝4(k＾2－k＾2＋x＾2＋y＾2＋z＾2)
＝4x＾2＋4y＾2＋4z＾2
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