3/4*4/5-3/4x=2/5 求X
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3/4*4/5-3/4x=2/5求X3/4*4/5-3/4x=2/5求X3/4*4/5-3/4x=2/5求X十五分之四
3/4*4/5-3/4x=2/5 求X
3/4*4/5-3/4x=2/5 求X
3/4*4/5-3/4x=2/5 求X
十五分之四
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