［文字サイズの変更］
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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)
(
−2.5
)
×
(
−8.3
)
×
(
＋
4
)
(2)
(
−3.5
)
×
(
＋
8.3
)
×
(
−2
)
(3)
(
−4.5
)
×
(
＋
1.3
)
×
(
＋
2
)
(4)
(
−2.5
)
×
(
＋
9.6
)
×
(
−4
)
(5)
(
−4.5
)
×
(
−4.3
)
×
(
−2
)
(6)
(
＋
125
)
×
(
−63
)
×
(
＋
8
)
(7)
(
＋
12.5
)
×
(
−9.4
)
×
(
−8
)
©2024 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
(
−2.5
)
×
(
−8.3
)
×
(
＋
4
)
=
(
−2.5
)
×
(
＋
4
)
×
(
−8.3
)
=
(
−10
)
×
(
−8.3
)
=
83
(2)
(
−3.5
)
×
(
＋
8.3
)
×
(
−2
)
=
(
−3.5
)
×
(
−2
)
×
(
＋
8.3
)
=
(
＋
7
)
×
(
＋
8.3
)
=
58.1
(3)
(
−4.5
)
×
(
＋
1.3
)
×
(
＋
2
)
=
(
−4.5
)
×
(
＋
2
)
×
(
＋
1.3
)
=
(
−9
)
×
(
＋
1.3
)
=
−11.7
(4)
(
−2.5
)
×
(
＋
9.6
)
×
(
−4
)
=
(
−2.5
)
×
(
−4
)
×
(
＋
9.6
)
=
(
＋
10
)
×
(
＋
9.6
)
=
96
(5)
(
−4.5
)
×
(
−4.3
)
×
(
−2
)
=
(
−4.5
)
×
(
−2
)
×
(
−4.3
)
=
(
＋
9
)
×
(
−4.3
)
=
−38.7
(6)
(
＋
125
)
×
(
−63
)
×
(
＋
8
)
=
(
＋
125
)
×
(
＋
8
)
×
(
−63
)
=
(
＋
1000
)
×
(
−63
)
=
−63000
(7)
(
＋
12.5
)
×
(
−9.4
)
×
(
−8
)
=
(
＋
12.5
)
×
(
−8
)
×
(
−9.4
)
=
(
−100
)
×
(
−9.4
)
=
940
(1)
83
(2)
58.1
(3)
−11.7
(4)
96
(5)
−38.7
(6)
−63000
(7)
940