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(3)
=-3(x²-2x)+2
=-3{(x-1)²-1}+2
=-3(x-1)²+3+2
=-3(x-1)²+5

(4)
=-(x²+3/2x)
=-{(x+3/4)²-9/16}
=-(x+3/4)²+9/16

dolce

ありがとうございます😊

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