= (9+7/8)×8 + (8+6/7)×7 + (7+5/6)×6 + (6+4/5)×5= (72+7) + (56+6) + (42+5) + (30+4)= 79 + 62 + 47 + 34= 222
9又7/8×8=9×8+7/8×8=72+7=79