25x398请问怎样简便计算(
简便运算:25×398 -
25×398 =25x(400-2)=25x400-25x2 =10000-50 =9950
25*398 =25*(400-2)=25*400-25*2 =10000-50 =9950
25×398 =25x(400-2)=25x400-25x2 =10000-50 =9950
25*398 =25*(400-2)=25*400-25*2 =10000-50 =9950
=25×400-25×2 =10000-50 =9550.
398x25 =（400-2）x25 =400x25-2x25 =10000-50 =9950
25x398怎样用简便方法计算 -
25x398 =25x(400-2)=25x400-25x2 =10000-50 =9950
回答：25*4*99.5 =100*99.5 =9950
25x398请问怎样简便计算? -
25x398 =25x(400-2)=25x400-25x2 =10000-50 =9950 满意请采纳谢谢，
25乘以400再减去50
用简便方法计算 25×398 99×46 -
25×398 =25x（400-2）25x400-2x25 =10000-50 =9950 99×46 =（100-1）x46 =100x46-1x46 =4600-46 =4554 谢谢，请采纳，
25x3.9 =25*（4-0.1）100-2.5 =97.5 满意采纳奥，