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▲
©2024 数学クラブ http://sugaku.club/
月 日( )
● くふうして計算
[06L-00]
(1)
(
−25
)
×
(
+
22
)
×
(
+
4
)
(2)
(
−125
)
×
(
−11
)
×
(
−8
)
(3)
(
+
4.5
)
×
(
−2.3
)
×
(
+
2
)
(4)
(
−450
)
×
(
−99
)
×
(
+
2
)
(5)
(
+
1.5
)
×
(
−6.8
)
×
(
−2
)
(6)
(
+
1.25
)
×
(
−0.67
)
×
(
−8
)
(7)
(
+
2.5
)
×
(
−4.7
)
×
(
−4
)
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
−25
)
×
(
+
22
)
×
(
+
4
)
=
(
−25
)
×
(
+
4
)
×
(
+
22
)
=
(
−100
)
×
(
+
22
)
=
−2200
(2)
(
−125
)
×
(
−11
)
×
(
−8
)
=
(
−125
)
×
(
−8
)
×
(
−11
)
=
(
+
1000
)
×
(
−11
)
=
−11000
(3)
(
+
4.5
)
×
(
−2.3
)
×
(
+
2
)
=
(
+
4.5
)
×
(
+
2
)
×
(
−2.3
)
=
(
+
9
)
×
(
−2.3
)
=
−20.7
(4)
(
−450
)
×
(
−99
)
×
(
+
2
)
=
(
−450
)
×
(
+
2
)
×
(
−99
)
=
(
−900
)
×
(
−99
)
=
89100
(5)
(
+
1.5
)
×
(
−6.8
)
×
(
−2
)
=
(
+
1.5
)
×
(
−2
)
×
(
−6.8
)
=
(
−3
)
×
(
−6.8
)
=
20.4
(6)
(
+
1.25
)
×
(
−0.67
)
×
(
−8
)
=
(
+
1.25
)
×
(
−8
)
×
(
−0.67
)
=
(
−10
)
×
(
−0.67
)
=
6.7
(7)
(
+
2.5
)
×
(
−4.7
)
×
(
−4
)
=
(
+
2.5
)
×
(
−4
)
×
(
−4.7
)
=
(
−10
)
×
(
−4.7
)
=
47
(1)
−2200
(2)
−11000
(3)
−20.7
(4)
89100
(5)
20.4
(6)
6.7
(7)
47