计算如下:3/8×4/15+11/15×5/8 =3/2×1/15+11/3×1/8 =1/2×1/5+11/3×1/8 =1/10+11/24 =12/120+55/120 =67/120 乘法的计算法则:1、多位数乘法法则整数乘法低位起,几位数乘法几次积。个位...
11/15×5/8 =12/120+55/120 =67/120
3/8×4/15+ 11/15×5/8
=12/120+55/120
=67/120
3/8X4/5+11/15x5/8
=3/10+11/24
=36/120+55/120
=91/120