Mathematics
Senior High
3段目から４段目にかけて何をしていますか？
(x+y-2)(x+y+4)+5
=(x+y)?+2(x+y)-8+5
=(x+y)°+2(x+y)-3
={(x+y)-1}{(x+y)+3}
=(x+y-1)(x+y+3)
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