Mathematics
Senior High
波線のところはなぜこうなったんですか？
})(5x)={(b+c)+a}²+{(b+c)=a}²
+{a-(b-c)}²+{a+(b-c)}²
=2{(b+c)²+a²}+2{a²+(b-c)²}
=4a²+2{(b+c)²+(b-c)²}
=4a²+2.2(b²+c²)
=4a²+46b²+4c²
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