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■文字と式 【 かっこの特訓3 】問題 次の計算をしなさい. 初めに [ ? ] を1つ選び,続いて下の欄から解答を1つ選びなさい.正しければ解答が入り,間違っていればもとに戻ります. 分からないときは ? を選んでから[解説]をクリック.再度問題を選べば解答できます. (※計算用紙を使ってもよい.) (1) 2(x2−3x+1)−3(x2+x−2)= [ ? ] (2) −2(2x2−3x+1)+(x2−2x+3)= [ ? ] (3) −(3x2+4x−5)−2(x2+x−2)= [ ? ] (4) 3(x2+2x−3)−4(x2−x−2)= [ ? ] (5) −3(2x2−2x−4)−2(−2x2+x+1)= [ ? ] |
−x2−5x−x2+10x−1 −x2+2x−1−x2−9x+8 −2x2+4x+10−2x2+8x+14 −3x2−5x+4−3x2+4x+1 −5x2−6x+9−5x2−2x+1 |
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