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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