加法
[0]
(+19) + (-15)
=
答え
x
+4
[1]
(+8) + (-12)
=
答え
x
-4
[2]
(+13) + (+11)
=
答え
x
+24
[3]
(+9) + (+7)
=
答え
x
+16
[4]
(+15) + (-9)
=
答え
x
+6
[5]
(-17) + (-6)
=
答え
x
-23
[6]
(-6) + (+12)
=
答え
x
+6
[7]
(-9) + (-17)
=
答え
x
-26
[8]
(-19) + (+8)
=
答え
x
-11
[9]
(-9) + (+16)
=
答え
x
+7
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