数学题.用脱式计算(紧急)
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数学题.用脱式计算(紧急)
(1)1.6÷0.25+0.96÷3.2
(2)2005×20062006-2006×20052005
(3)21/22×{(5/6-4/9)÷7/11}
紧急.要全过程.谢谢 紧急..
(1)1.6÷0.25+0.96÷3.2
(2)2005×20062006-2006×20052005
(3)21/22×{(5/6-4/9)÷7/11}
紧急.要全过程.谢谢 紧急..
![数学题.用脱式计算(紧急)](/uploads/image/z/2392773-69-3.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98.%E7%94%A8%E8%84%B1%E5%BC%8F%E8%AE%A1%E7%AE%97%EF%BC%88%E7%B4%A7%E6%80%A5%EF%BC%89)
1)1.6÷0.25+0.96÷3.2
=1.6*4+0.3
=6.7
(2)2005×20062006-2006×20052005
=2005*2006*10001-2006*2005*10001
=0
(3)21/22×{(5/6-4/9)÷7/11}
=21/22×{21/54*11/7}
=21*21*11/22*54*7
=21*3/2*54
=21/2*18
=7/12
=1.6*4+0.3
=6.7
(2)2005×20062006-2006×20052005
=2005*2006*10001-2006*2005*10001
=0
(3)21/22×{(5/6-4/9)÷7/11}
=21/22×{21/54*11/7}
=21*21*11/22*54*7
=21*3/2*54
=21/2*18
=7/12