54*99+99用简便运算
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54*99+99用简便运算54*99+99用简便运算54*99+99用简便运算54*99+99=54*(100-1)+99=54*100-54+99=5400+45=5445=54*(99+1)=54
54*99+99用简便运算
54*99+99用简便运算
54*99+99用简便运算
54*99+99=54*(100-1)+99=54*100-54+99=5400+45=5445
=54*(99+1)=54*100=5400
54*99+99=55*99=55*(100-1)=5500-55=5445
1楼SB
99X(54+1)=(100-1)55=5500-55=5445
54*99+99=
99(54+1)=99*55=(100-1)*55=5500-55=5445
54*99+99
=54*(100 -1)+99
=54* 100 -54 +99
=5400 + 45
= 5445