[0.6×﹙2又3/5+27×8/9﹚]÷3/50
＝3/5x50/3x(2.6+24)
=10x26.6
=266得数是50那你的27 打错了 是2.7[0.6×﹙2又3/5+2.7×8/9﹚]÷3/50＝3/5x50/3x(2.6+2.4)=10x5=50