Mathematics
Senior High
上の式の変形の仕方が分からないので、なぜそうなるのかを教えて頂けないでしょうか？(>_<;)
7 (1)
b-a
(b²-a²)-2(b-a)_ (b-a)(b+a-2)
b-a
b-a
=a+b-2
{(1+h)²-(1h)}-(2・1²-1)
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