用简便方法计算:41又3分之1*4分之3+51又4分之1*5分之4+64又5分之1*6分之5

问题描述:

用简便方法计算:41又3分之1*4分之3+51又4分之1*5分之4+64又5分之1*6分之5

(41+1/3)*3/4+(51+1/4)*(4/5)+(64+1/5)*(5/6)=(40+4/3)*3/4+(50+5/4)*(4/5)+(60+21/5)*(5/6)=40*3/4+1+50*4/5+1+60*5/6+21/6=31+41+50+3+1/2=125又1/2(41+1/3)*3/4+(51+1/4)*(4/5)+(64+1/5)*(5/6)=124/3*3/4+205/4*4...