六年级数学五道分数,小数混合运算题1+1/2-5/6+7/12-9/20+11/30=？

1+1/2-5/6+7/12-9/20+11/30=1+1/2-(1/2+1/3)+1/3+1/4-(1/4+1/5)+1/5+1/6=1+1/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6=1+1/6=1.16667

解: 1+1/2－5/6+7/12－9/20+11/30
=60/60+30/60－50/60+35/60
－27/60+22/60
=(60+30+35+22)/60－(50+27)/60
=(147-77)/60
=70/60
=7/6
=1又1/6本回答被网友采纳