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練習問題3(文字式と数の乗法・除法)解答

練習問題3(文字式の計算。加法・乗法)解答


(1) 3χ+(7χ-5)


  =3χ+7χ-5


  =10χ−5


   答え 10χ−5



(2) -6χ+(8-χ)


  =-6χ+8-χ


  =-6χ-χ+8


  =−7χ+8


   答え −7χ+8



(3) 4y-2+(-7y-2)


  =4y-2-7y-2


  =4y-7y-2-2


  =−3y−4


   答え −3y−4



(4) 5χ-(3χ-8)


  =5χ-3χ+8


  =2χ+8


   答え 2χ+8



(5) a-7-(-2a+3)


  =a-7+2a−3


  =a+2a−3-7


  =3a−10


   答え 3a−10



(6) 2y+10-(6-4y)


  =2y+10-6+4y


  =2y+4y+10-6


  =6y+4


   答え 6y+4



(7) (5χ+6)+(2χ-9)


  =5χ+6+2χ-9


  =5χ+2χ-9+6


  =7χ−3


   答え 7χ−3



(8) (4χ-2)-(χ+3)


  =4χ-2-χ-3


  =4χ-χ-3-2


  =3χ−5


   答え 3χ−5



(9) (8χ-7)-(3-6χ)


  =8χ-7-3+6χ


  =8χ+6χ-7-3


  =14χ−10


   答え 14χ−10

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