简算:(3/10-1/5+1/4)*20
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简算:(3/10-1/5+1/4)*20
简算:(3/10-1/5+1/4)*20
简算:(3/10-1/5+1/4)*20
(3/10-1/5+1/4)*20
=3/10x20-1/5x20+1/4x20
=6-4+5
=7
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