六年级数学题(2011希望杯)真题啊!希望你们能帮我做做直接写答案题:1.对于任意两个数X,Y定义新运算,运算规则如下:( ❤是运算符号 )X ❤Y = X 乘 Y-X除2,X +Y=X+Y除2按此规律计算,3.

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