53/60
请采纳谢谢
解:3/4 +2/15等于( 53/60 )
∵已知需求出3/4 +2/15等于多少
X + Y = Z
∴3/4 + 2/15
= (3×15)/(4×15)+(2×4)/(15×4)
= 45/60 + 8/60
= (45+8)/60
= 53/60
答:3/4 +2/15等于53/60
通分,等于45/60十8/60等于53/60
3/4+2/15
=45/60+8/60
=53/60