乗法
[0]
(+5) ✕ (-8)
=
答え
x
-40
[1]
(-8) ✕ (+9)
=
答え
x
-72
[2]
(-4) ✕ (+2)
=
答え
x
-8
[3]
(+8) ✕ (-8)
=
答え
x
-64
[4]
(-5) ✕ (+7)
=
答え
x
-35
[5]
(-4) ✕ (+5)
=
答え
x
-20
[6]
(-4) ✕ (-6)
=
答え
x
+24
[7]
(-9) ✕ (-4)
=
答え
x
+36
[8]
(+5) ✕ (+2)
=
答え
x
+10
[9]
(+6) ✕ (-8)
=
答え
x
-48
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