简算:9/10-(1/4+7/20)/3/4
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简算:9/10-(1/4+7/20)/3/4
简算:9/10-(1/4+7/20)/3/4
简算:9/10-(1/4+7/20)/3/4
9/10-(1/4+7/20)/3/4
=9/10-3/5×4/3
=9/10-4/5
=1/10
简算:9/10-(1/4+7/20)/3/4
简算:9/10-(1/4+7/20)/3/4
简算:9/10-(1/4+7/20)/3/4
9/10-(1/4+7/20)/3/4
=9/10-3/5×4/3
=9/10-4/5
=1/10