简便的方法 题:4/9×338/15+16×1/9+2/9×4/15
4/9×338/15+16×1/9+2/9×4/15
=4/9×338/15+4×4/9+4/9×2/15
=4/9×(338/15+60/15+2/15)
=4/9×400/15
=320/27
简便的方法 题:4/9×338/15+16×1/9+2/9×4/15
4/9×338/15+16×1/9+2/9×4/15
=4/9×338/15+4×4/9+4/9×2/15
=4/9×(338/15+60/15+2/15)
=4/9×400/15
=320/27