Mathematics
Junior High
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（3）の赤ペンで書いた答えでもあっていますか？？
3 次の式の同類項をまとめて簡単にしなさい。
(1) 3x²-2x+x²+x-1
=(3+1)x2+(-2+1)x-1
= 4x²-x-1
(3) 2x²+y+7x² + 3y+x
= (2+7) x² +x+(1+3)y
= 9x² + x + 4y
9x2+4y+x
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![中学3年2次方程式の問題です。
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指定はないです！ありがとうございます＾＾