17-8= 11-3= 53-50= 6+2+8=
40+2= 16-7= 17-9= 78-70+3=
89-9= 6+8= 82+7= 65-60+80=
75-30= 54+3= 65-5= 8-5+30=
微信扫码预览、分享更方便