分数加、减法练习(2)
1: 2/5 1/3 1
2/9 12/35 1/3
2: 1/4 2/5
4/3 34/35
3: 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
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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
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