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98x199用巧算怎么做

原式=98×(200-1) =98×200-98×1 =19600-98 =19600-100+2

答:这个题巧算的话,是把4.98当成5-0.02,然后依乘法分配律来分别求与3.6的积,最后求差得出

运用乘法分配律 98×27 =(100-2)×27 =100×27-2×27 =2700-5

0.98X2.5 =0.49X2X2.5 =0.49X5 =0.5X5-0.01X5 =2.

你好! 原式=1999(2000-1998)+1997(1998-1996) =1999×2

98766×9876898765x98769(巧算)  我来答 分享新浪

1998*20002000-2000*19981998 =1998*2000*(10001-100

(980×65-320)÷(66+98×64) =(980×64+980-320)÷(98×64+

1) 2003*20022001-2001*20022003 =(2002+1)*200220

解: 用裂项的思想 1/12x13+1/13x14+1/14x15+…+1/98x99+1/99

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