Mathematics
Senior High
Solved
お願いします🙇
⑴⑵等式変形の後からが分からないです。
293 次の等式を満たす自然数x, yの組をすべて求めよ。
(1)x-y'=21とい
*(3) x-y=28
*(2) 4x²-y2=-9
(4)9x2-4y2=81
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