4/9+3/8=32/72+27/72=59/72请采纳！可追问！
遇到分数和差计算，先算分母最小公倍数再化为同分母分子相加，题中化为32/72+27/72=59/72
解：4/9+3/8原式=32/72＋27/72 =59/72
4/9+3/8＝32/72+27/72＝59/72
