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▲
©2025 数学クラブ http://sugaku.club/
月 日( )
● くふうして計算
[06L-00]
(1)
(
+
2.5
)
×
(
+
3.6
)
×
(
−4
)
(2)
(
−125
)
×
(
+
24
)
×
(
−8
)
(3)
(
−125
)
×
(
+
96
)
×
(
−8
)
(4)
(
+
3.5
)
×
(
−2.8
)
×
(
+
2
)
(5)
(
−450
)
×
(
+
24
)
×
(
+
2
)
(6)
(
−45
)
×
(
+
7.1
)
×
(
+
2
)
(7)
(
−450
)
×
(
−51
)
×
(
−2
)
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
+
2.5
)
×
(
+
3.6
)
×
(
−4
)
=
(
+
2.5
)
×
(
−4
)
×
(
+
3.6
)
=
(
−10
)
×
(
+
3.6
)
=
−36
(2)
(
−125
)
×
(
+
24
)
×
(
−8
)
=
(
−125
)
×
(
−8
)
×
(
+
24
)
=
(
+
1000
)
×
(
+
24
)
=
24000
(3)
(
−125
)
×
(
+
96
)
×
(
−8
)
=
(
−125
)
×
(
−8
)
×
(
+
96
)
=
(
+
1000
)
×
(
+
96
)
=
96000
(4)
(
+
3.5
)
×
(
−2.8
)
×
(
+
2
)
=
(
+
3.5
)
×
(
+
2
)
×
(
−2.8
)
=
(
+
7
)
×
(
−2.8
)
=
−19.6
(5)
(
−450
)
×
(
+
24
)
×
(
+
2
)
=
(
−450
)
×
(
+
2
)
×
(
+
24
)
=
(
−900
)
×
(
+
24
)
=
−21600
(6)
(
−45
)
×
(
+
7.1
)
×
(
+
2
)
=
(
−45
)
×
(
+
2
)
×
(
+
7.1
)
=
(
−90
)
×
(
+
7.1
)
=
−639
(7)
(
−450
)
×
(
−51
)
×
(
−2
)
=
(
−450
)
×
(
−2
)
×
(
−51
)
=
(
+
900
)
×
(
−51
)
=
−45900
(1)
−36
(2)
24000
(3)
96000
(4)
−19.6
(5)
−21600
(6)
−639
(7)
−45900