奇数与偶数的和、差,结果还是奇数.
偶数与偶数、奇数与奇数的和差 ,结果一定是偶数.
一年级13-4=9,12-5=7,11-4=7,15-9=6.；20+60=80,60-20=40,25-6=19,35
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