x1²+x2²=﹙x1+x2﹚²-2x1x2还有类试的吗
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x1²+x2²=﹙x1+x2﹚²-2x1x2还有类试的吗
x1²+x2²=﹙x1+x2﹚²-2x1x2还有类试的吗
x1²+x2²=﹙x1+x2﹚²-2x1x2还有类试的吗
a²+b²=(a-b)²+2ab
a³+b³=(a+b)³-3ab(a+b)
a³-b³=(a-b)³-3ab(a-b)
.
这些算类似的不呢?