奥数计算351又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5

奥数计算351又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5
奥数计算3
51又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5

奥数计算351又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5
51又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5
=51又2/3×3/5+71又3/4×4/7+91又4/5×5/9
=(50+1)×3/5+2/3×3/5+（70+1）×4/7+3/4×4/7+（90+1)×5/9+4/5×5/9
=50×3/5+3/5+2/5+70×4/7+4/7+3/7+90×5/9+5/9+4/9
=30+1+40+1+50+1
=123

原式=50又5/3×3/5+70又7/4x4/7+90又9/5x5/9
=50x3/5x1+70x4/7x1+90x5/9x1
=30＋40＋50
=120