解:7/10-3/5加1/2等于( 3/5 )
∵已知需求出7/10-3/5加1/2等于几分之几
∴7/10-3/5加1/2
= 7/10 - 3/5 + 1/2
= 7/10 - (3×2)/(5×2)+(1×5)/(2×5)
= 7/10 - 6/10 + 5/10
= 1/10 + 5/10
= 6/10
= 3/5
答:7/10-3/5加1/2等于3/5
3/5
请采纳谢谢
7/10-3/5+1/2
=7/10-6/10+5/10
=1/10+5/10
=6/10
=3/5
通分加减计算就可以了。