问题描述:
2/3-3/5=()-()=() 3/7-2/21= 3/8+1/6=
2/3-3/5=()-()=()
3/7-2/21=
3/8+1/6=()+()=()
2/15+1/35
2/3-3/5=()-()=()
3/7-2/21=
3/8+1/6=()+()=()
2/15+1/35
问题解答:
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