Mathematics
Senior High
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このピンクのところはどうゆう計算をしたらこの数字がでてきますか

SERIKEESOR( PP 1011ca4 10,1 *** y=-2x²+4x+1 =-2(x-2x)+1 =-2{(x-1)2-1}+1 =-2(x-1)2+2+1 =-2(x-1)+3

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