51又2/3*3/5+71又3/4*4/7+91又4/5除9/5 简便计算

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51又2/3*3/5+71又3/4*4/7+91又4/5除9/5 简便计算

51又2/3*3/5+71又3/4*4/7+91又4/5除9/5
=(50+5/3)*3/5+(70+7/4)*4/7+(90+9/5)×5/9
=30+1+40+1+50+1
=123

51又2/3*3/5+71又3/4*4/7+91又4/5除9/5
=(50+5/3)*3/5+(70+7/4)*4/7+(90+9/5)×5/9
=30+1+40+1+50+1
=123