@ 40−6= 35 24 38 34 28 A 80−7= 77 63 73 67 65 B 50−2= 48 45 38 35 45 C 32−4= 30 26 18 22 28 D 67−8= 42 59 55 49 52 E 82−6= 72 74 76 78 80
しきは 25 20 26 8 3 − 3 5 8 26 20 = 18 17 26 20 22