(9991×1999.1999+9991.9991×1999)÷2.0002
(9991×1999.1999+9991.9991×1999)÷2.0002
数学人气:458 ℃时间:2019-11-01 22:50:59
优质解答
(9991×1999.1999+9991.9991×1999)÷2.0002=( 9991×1999×10001÷10000 + 9991×10001×1999÷ 10000)÷(10001×2÷10000)=( 9991×1999 + 9991×1999)÷2= 9991× 1999= 9991×2000 - 9991= 19982000 - 9...
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