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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 次の式を，記号×÷を使って書きましょう
[079-00]
(1)
7
(
a
−
b
)
c
(2)
a
b
＋
4
(3)
2
a
a
d
＋
b
c
b
c
(4)
a
＋
c
d
b
＋
9
(5)
3
a
＋
b
b
(6)
a
7
−
−
c
b
b
(7)
a
b
＋
10
b
(8)
a
b
＋
9
b
(9)
5
a
b
＋
a
b
c
(10)
a
＋
b
＋
10
c
d
(11)
4
a
＋
4
b
(12)
a
c
2
a
−
b
b
(13)
(
9
＋
a
)
c
−
d
b
(14)
a
＋
5
b
d
＋
b
c
d
(15)
a
b
＋
a
c
＋
8
(16)
5
(
a
＋
b
)
c
d
(17)
a
＋
3
b
c
−
3
b
d
(18)
a
b
＋
9
b
＋
c
(19)
4
a
＋
a
b
−
c
(20)
6
a
a
b
−
c
c
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
7
(
a
−
b
)
c
=
(
a
−
b
)
×
7
÷
c
(2)
a
b
＋
4
=
a
÷
(
b
＋
4
)
(3)
2
a
a
d
＋
b
c
b
c
=
2
×
a
÷
b
÷
c
＋
a
÷
b
÷
c
×
d
(4)
a
＋
c
d
b
＋
9
=
a
÷
(
b
＋
9
)
＋
c
×
d
(5)
3
a
＋
b
b
=
3
÷
b
＋
a
÷
b
(6)
a
7
−
−
c
b
b
=
a
÷
b
−
7
÷
b
−
c
(7)
a
b
＋
10
b
=
a
×
b
＋
10
×
b
(8)
a
b
＋
9
b
=
a
×
b
＋
9
×
b
(9)
5
a
b
＋
a
b
c
=
5
×
a
×
b
＋
a
×
b
×
c
(10)
a
＋
b
＋
10
c
d
=
a
＋
b
＋
10
×
c
×
d
(11)
4
a
＋
4
b
=
4
×
a
＋
4
×
b
(12)
a
c
2
a
−
b
b
=
a
÷
b
×
c
−
2
×
a
÷
b
(13)
(
9
＋
a
)
c
−
d
b
=
(
9
＋
a
)
÷
b
×
c
−
d
(14)
a
＋
5
b
d
＋
b
c
d
=
a
＋
5
×
b
×
d
＋
b
×
c
×
d
(15)
a
b
＋
a
c
＋
8
=
a
×
b
＋
a
×
c
＋
8
(16)
5
(
a
＋
b
)
c
d
=
5
×
(
a
＋
b
)
÷
c
÷
d
(17)
a
＋
3
b
c
−
3
b
d
=
a
＋
3
×
b
×
c
−
3
×
b
×
d
(18)
a
b
＋
9
b
＋
c
=
a
×
b
＋
9
×
b
＋
c
(19)
4
a
＋
a
b
−
c
=
4
×
a
＋
a
×
b
−
c
(20)
6
a
a
b
−
c
c
=
6
×
a
÷
c
−
a
×
b
÷
c