你把58拆分成50+8; 11X 58 = 11 X ( 50 + 8) =11 X 50 + 11 X 8 =550 + 88 = 638
12拆成10 + 2 ; 12 X 9 = (10+2)X 9 = 10 X 9 + 2 X 9 =90 + 18 = 108
望采纳,有问题继续问我!
你把58拆分成50+8; 11X 58 = 11 X ( 50 + 8) =11 X 50 + 11 X 8 =550 + 88 = 638
12拆成10 + 2 ; 12 X 9 = (10+2)X 9 = 10 X 9 + 2 X 9 =90 + 18 = 108
望采纳,有问题继续问我!