用简便方法计算下面各题18x(3/1+9/5-6/1）27/11x42/53x11/548/3x75/79x24x2511/23x（2/11x3/1-46/77）8/3那里隔开

Answer 1

18x(3/1+9/5-6/1）=18*(9/5-15/5)=18*(-6/5)=-108/5
27/11x42/53x11/54=27/11*11/54*42/53=1/2*42/53=21/53
8/3x75/79x24x25=8/3*24*75/79*25=64*3/79=192/79
11/23x（2/11x3/1-46/77）=11/23*2/11*3-11/23*46/77=6/23-2/7=(6*7-2*23)/(23*7)=-4/161