51又2/3*3/5+71又3/4+91又4/5*5/9简便计算

51又2/3*3/5+71又3/4+91又4/5*5/9简便计算
51又2/3*3/5+71又3/4+91又4/5*5/9简便计算

51又2/3*3/5+71又3/4+91又4/5*5/9简便计算
51又2/3*3/5+71又3/4+91又4/5*5/9
=(155/3)*(3/5)+287/4+(459/5)*(5/9)
=31+287/4+51
=82+287/4
=153又3/4

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

(50+5/3)*3/5+71+3/4+(90+9/5)*5/9
=30+1+71+3/4+50+1
=153+3/4
=153又3、4