減法

[0]	(+19) − (-11)	=	答え ｘ +30
[1]	(+18) − (+16)	=	答え ｘ +2
[2]	(-16) − (-17)	=	答え ｘ +1
[3]	(+10) − (+14)	=	答え ｘ -4
[4]	(-11) − (-18)	=	答え ｘ +7
[5]	(-18) − (-11)	=	答え ｘ -7
[6]	(-6) − (-11)	=	答え ｘ +5
[7]	(+13) − (-15)	=	答え ｘ +28
[8]	(+6) − (+15)	=	答え ｘ -9
[9]	(-14) − (-12)	=	答え ｘ -2

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