原式=(84+4/119)*1.375+(105+5/119)*0.9=84*`1.375+105*0.9+(4*1.375+4.5)/119
=84*(1+3/8)+94.5+9/119
=84+21*3/2+94.5+9/119
=210又9/119
原式=(84+4/119)*1.375+(105+5/119)*0.9=84*`1.375+105*0.9+(4*1.375+4.5)/119
=84*(1+3/8)+94.5+9/119
=84+21*3/2+94.5+9/119
=210又9/119