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16/7-16/7*9/299*1/10013/20*99+13/20这三道,麻烦你了
题目详情
16/7-16/7*9/2 99*1/100 13/20*99+13/20 这三道,麻烦你了
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答案和解析
16/7-16/7*9/2
=16/7x(1-9/2 )
=16/7x(-7/2 )
=-8
(2)
99*1/100
=(100-1)*1/100
=100*1/100-1*1/100
=1-1/100
=99/100
(3)
13/20*99+13/20
= 13/20*(99+1)
= 13/20*100
=65
=16/7x(1-9/2 )
=16/7x(-7/2 )
=-8
(2)
99*1/100
=(100-1)*1/100
=100*1/100-1*1/100
=1-1/100
=99/100
(3)
13/20*99+13/20
= 13/20*(99+1)
= 13/20*100
=65
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