乗法
[0]
(+4) ✕ (-2)
=
答え
x
-8
[1]
(+2) ✕ (+3)
=
答え
x
+6
[2]
(-5) ✕ (-3)
=
答え
x
+15
[3]
(+5) ✕ (+8)
=
答え
x
+40
[4]
(+2) ✕ (-2)
=
答え
x
-4
[5]
(-6) ✕ (+9)
=
答え
x
-54
[6]
(-6) ✕ (+3)
=
答え
x
-18
[7]
(+8) ✕ (-4)
=
答え
x
-32
[8]
(+4) ✕ (+3)
=
答え
x
+12
[9]
(+7) ✕ (+8)
=
答え
x
+56
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