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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
[07B-00]
(1)
3
a
−
10
b
+
c
(2)
3
a
+
b
c
d
+
8
(3)
3
2
a
(4)
3
9
a
+
+
c
b
(5)
3
3
+
a
(6)
3
a
+
b
c
+
6
+
d
(7)
4
2
b
a
+
+
d
c
(8)
3
a
+
b
+
2
c
−
d
(9)
4
3
+
a
b
(10)
3
a
−
4
(11)
3
10
a
b
(12)
4
7
−
a
b
(13)
4
10
b
a
−
c
(14)
3
7
c
a
+
b
d
(15)
2
a
−
b
−
c
+
5
+
d
(16)
4
b
a
+
10
+
c
(17)
4
7
−
a
(18)
4
a
b
c
−
2
(19)
3
a
b
−
4
(20)
3
8
−
a
−
b
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
3
a
−
10
b
+
c
=
a
−
10
×
b
×
b
×
b
+
c
(2)
3
a
+
b
c
d
+
8
=
a
+
b
×
b
×
b
×
c
×
d
+
8
(3)
3
2
a
=
2
×
2
×
2
×
a
(4)
3
9
a
+
+
c
b
=
a
+
9
×
9
×
9
÷
b
+
c
(5)
3
3
+
a
=
3
+
a
×
a
×
a
(6)
3
a
+
b
c
+
6
+
d
=
a
+
b
×
c
+
6
×
6
×
6
+
d
(7)
4
2
b
a
+
+
d
c
=
a
+
2
×
2
×
2
×
2
×
b
÷
c
+
d
(8)
3
a
+
b
+
2
c
−
d
=
a
+
b
+
2
×
c
−
d
×
d
×
d
(9)
4
3
+
a
b
=
3
+
a
×
b
×
b
×
b
×
b
(10)
3
a
−
4
=
a
−
4
×
4
×
4
(11)
3
10
a
b
=
10
×
10
×
10
×
a
×
b
(12)
4
7
−
a
b
=
7
−
a
×
a
×
a
×
a
×
b
(13)
4
10
b
a
−
c
=
a
−
10
×
10
×
10
×
10
×
b
÷
c
(14)
3
7
c
a
+
b
d
=
a
+
7
×
7
×
7
÷
b
×
c
÷
d
(15)
2
a
−
b
−
c
+
5
+
d
=
a
−
b
×
b
−
c
+
5
+
d
(16)
4
b
a
+
10
+
c
=
a
+
10
×
10
×
10
×
10
+
b
÷
c
(17)
4
7
−
a
=
7
−
a
×
a
×
a
×
a
(18)
4
a
b
c
−
2
=
a
×
b
×
b
×
b
×
b
×
c
−
2
(19)
3
a
b
−
4
=
a
×
b
×
b
×
b
−
4
(20)
3
8
−
a
−
b
=
8
−
a
×
a
×
a
−
b