(9991×1999.1999+9991.9991×1999)÷2.0002
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(9991×1999.1999+9991.9991×1999)÷2.0002(9991×1999.1999+9991.9991×1999)÷2.0002(9991×1999.1999+9991.999
(9991×1999.1999+9991.9991×1999)÷2.0002
(9991×1999.1999+9991.9991×1999)÷2.0002
(9991×1999.1999+9991.9991×1999)÷2.0002
(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 - 9991
= 19972009
(9991×1999.1999+9991.9991×1999)÷2.0002
=(9991*1999*1.0001+9991*1.0001*1999)/2.0002=9991*1999(1.0001+1.0001)/2.0002
=9991*1999*2.0002/2.0002
=9991*1999
=9991*(2000-1)
=19982000-9991
=19972009
(9991×1999.1999+9991.9991×1999)÷2.0002
求文档:(9991*1999.1999+1999*9991.9991)/2.0002(9991×1999.1999+1999×9991.9991)÷2.0002
(9991*1999.1999+9991.9991*1999)/2.0002 尽量简算
简算:(9991*1999.1999+9991.9991*1999)/2.0002=
(9991乘1999.1999+9991.9991乘1999)除以2.0002要简便
小学→这题怎么简算(9991×1999.1999+9991.9991×1999)÷2.0002
帮忙解一道算数题好吗?(9991×1999.1999+9991.9991×1999)÷2.0002
(9991*1999.1999+999.999.1*1999)/2.00021.56*1 4/9+8.56*7 5/9+8.562.最大是的负整数是什么?
巧算 9991+999.1+99.91+9.991
X²-6X-9991
x^2-6x-9991=0
7771和9991算24?只能用数学符号.
1.1+1.91+1.991+.+1.99.9991.99.9991是100个9
解方程x²-6x-9991=0
91/3+991/3+9991/3+22/3怎样简便
(9991x1999.1999+9991.9991x1999)除2.0002
9991分解成两个素数要回答哦
哪两个素数的积是9991,用因式分解