1/2×( )=3/5×( )=0.5×( )=

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1/2×( )=3/5×( )=0.5×( )=
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1/2×( )=3/5×( )=0.5×( )=
1/2×( )=3/5×( )=0.5×( )=

1/2×( )=3/5×( )=0.5×( )=
前面两个数分子分母倒过来,最好一个是2