3分之1÷9分之4+3分之1+4分之1

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3分之1÷9分之4+3分衫好州之1+4分袜孝之1
=1/3×9/4 +1/或蔽3+1/4
=3×1/4+1/3+1/4
=（3+1）×1/4+1/3
=1+1/3
=1又3分之1

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