分数加、减法练习(2)1: 2/5 1/3 1 2/9 12/35 1/32: 1/4+x=1/2 x+3/5=1 x=1/2-1/4 x=1- 3/5 x=1/4 x=2/5 x-1/2=5/6 x-4/7=2/5 x=5/6+1/2 x=2/5+4/7 x= 4/3 x=34/353: 7/8+4/7+1/8 1/6+3/5+2/5+1/6 =7/8+1/8+4/7 =(1/6+1/6)+(3/5+2/5) =1+4/7 =1/3+1 =1又4/7 =1又1/3本答案出自零五网网址:http://www.05Wang.com/thread-21179-1-1.html 9/5-2/7-5/7 5/9-3/8+4/9-3/8 =9/5-(2/7+5/7 ) =(5/9+4/9)-(3/8+3/8) =9/5-1 =1-3/4 =4/5 =1/4 5/6-(3/4-1/2) 2/5+2/3-2/5 =5/6 |