0.25的2009次方乘以4的2010次方-8的670次方乘以0.5的2010次方怎样计算

0.25^2009×4^2010-8^670×0.5^2010
= 0.25^2009×4^(2009+1)-(2^3)^670×0.5^2010
= 0.25^2009×(4^2009×4^1)-2^(3×670)×0.5^2010
= 0.25^2009×4^2009×4-2^2010×0.5^2010
= (0.25×4)^2009×4-(2×0.5)^2010
= 1^2009×4-1^2010
= 1×4-1
= 3