［文字サイズの変更］
▼
▲
©2018 数学クラブ http://sugaku.club/
月 日（ ）
● 次の式を，文字式の表し方にしたがって書きましょう
[07A-00]
(1)
a
×
b
−
7
×
7
×
7
×
7
(2)
4
＋
a
×
a
(3)
(
−6
)
＋
a
×
a
×
a
(4)
a
÷
b
÷
c
×
(
−5
)
×
(
−5
)
×
(
−5
)
×
(
−5
)
−
d
(5)
10
＋
a
×
b
＋
c
×
c
×
c
(6)
a
×
b
−
4
×
c
×
c
×
c
(7)
8
×
a
×
a
×
a
(8)
10
×
a
×
a
×
a
＋
b
×
c
(9)
a
−
b
×
b
×
b
×
b
−
8
(10)
a
−
2
×
2
×
2
×
2
(11)
3
×
a
×
a
×
a
×
a
×
b
＋
c
(12)
a
＋
b
×
c
×
d
×
d
×
3
(13)
a
×
(
−5
)
×
(
−5
)
×
(
−5
)
×
(
−5
)
÷
b
(14)
a
＋
b
×
b
＋
6
(15)
a
−
10
×
b
×
c
×
c
×
c
÷
d
(16)
7
＋
a
×
a
×
a
(17)
(
−4
)
×
a
×
a
×
a
(18)
a
＋
b
×
b
×
b
×
b
＋
c
÷
8
(19)
a
÷
(
−4
)
−
b
×
b
−
c
(20)
a
÷
3
×
b
＋
c
×
c
×
d
©2018 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
a
×
b
−
7
×
7
×
7
×
7
4
=
a
b
−
7
(2)
4
＋
a
×
a
2
=
4
＋
a
(3)
(
−6
)
＋
a
×
a
×
a
3
=
−6
＋
a
(4)
a
÷
b
÷
c
×
(
−5
)
×
(
−5
)
×
(
−5
)
×
(
−5
)
−
d
4
(
−5
)
a
=
−
d
b
c
(5)
10
＋
a
×
b
＋
c
×
c
×
c
3
=
10
＋
a
b
＋
c
(6)
a
×
b
−
4
×
c
×
c
×
c
3
=
a
b
−
4
c
(7)
8
×
a
×
a
×
a
3
=
8
a
(8)
10
×
a
×
a
×
a
＋
b
×
c
3
=
10
a
＋
b
c
(9)
a
−
b
×
b
×
b
×
b
−
8
4
=
a
−
b
−
8
(10)
a
−
2
×
2
×
2
×
2
4
=
a
−
2
(11)
3
×
a
×
a
×
a
×
a
×
b
＋
c
4
=
3
a
b
＋
c
(12)
a
＋
b
×
c
×
d
×
d
×
3
2
=
a
＋
3
b
c
d
(13)
a
×
(
−5
)
×
(
−5
)
×
(
−5
)
×
(
−5
)
÷
b
4
(
−5
)
a
=
b
(14)
a
＋
b
×
b
＋
6
2
=
a
＋
b
＋
6
(15)
a
−
10
×
b
×
c
×
c
×
c
÷
d
3
10
b
c
=
a
−
d
(16)
7
＋
a
×
a
×
a
3
=
7
＋
a
(17)
(
−4
)
×
a
×
a
×
a
3
=
−4
a
(18)
a
＋
b
×
b
×
b
×
b
＋
c
÷
8
4
c
=
a
＋
b
＋
8
(19)
a
÷
(
−4
)
−
b
×
b
−
c
a
2
=
−
−
b
−
c
4
(20)
a
÷
3
×
b
＋
c
×
c
×
d
a
b
2
=
＋
c
d
3