7/8×[4/3–（16/7–4/1）]
=7/8×[4/3–（16/7–28/7）]
=7/8×[4/3+12/7]
=7/8×[28/21+36/21]
=7/8×64/21
=8/3
有点难啊
7/8×［4/3-（16/7-4/1）］=7/8×（1-16/7）=7/8×1-7/8×16/7=7/8-2/1=16/9答题不易，求采纳！
