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(-3)-6=________,35-47=________,(-6)-(-9)=________,12-(-25)=________,(-24)-0=________.
5×(-2.4)=________,(-1.25)×8=________,(-6.5)×()×0×0.001=________.
x2-y2=25,则(x-y)2(x+y)2=( )
0.25×55=________,0.1257×87________,0.252004×(-4)2005=________.
若a=25,b=-3,试确定a1 999+b2 000的末位数字是几?