4/5-3/10+2/3=8/10-3/10+2/3
=5/10+2/3
=1/2+2/3
=3/6+4/6
=7/6.
4/5-3/10+2/3
=8/10-3/10+2/3
=5/10+2/3
=1/2+2/3
=3/6+4/6
=7/6
一步一步算 7/6
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