作业帮先化简,再求值：（a+b／2ab²）³÷（a²-b²／ab²）²÷[1／2（a-b）]²其中a＝-½，b＝三分之二
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![先化简,再求值：（a+b／2ab²）³÷（a²-b²／ab²）²÷[1／2（a-b）]²其中a＝-½，b＝三分之二](/uploads/image/z/1672864-16-4.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A%EF%BC%88a%2Bb%EF%BC%8F2ab%26%23178%3B%EF%BC%89%26%23179%3B%C3%B7%EF%BC%88a%26%23178%3B-b%26%23178%3B%EF%BC%8Fab%26%23178%3B%EF%BC%89%26%23178%3B%C3%B7%5B1%EF%BC%8F2%EF%BC%88a-b%EF%BC%89%5D%26%23178%3B%E5%85%B6%E4%B8%ADa%EF%BC%9D-%26%23189%3B%EF%BC%8Cb%EF%BC%9D%E4%B8%89%E5%88%86%E4%B9%8B%E4%BA%8C)
先化简,再求值：（a+b／2ab²）³÷（a²-b²／ab²）²÷[1／2（a-b）]²其中a＝-½，b＝三分之二
先化简,再求值：（a+b／2ab²）³÷（a²-b²／ab²）²÷[1／2（a-b）]²
其中a＝-½，b＝三分之二
先化简,再求值：（a+b／2ab²）³÷（a²-b²／ab²）²÷[1／2（a-b）]²其中a＝-½，b＝三分之二
（a+b／2ab²）³÷（a²-b²／ab²）²÷[1／2（a-b）]²
=(a+b)³/8(ab²)³x(ab²)²/(a+b)²(a-b)²x4/(a-b)²
=(a+b)/8ab²(a-b)²x4/(a-b)²
=(a+b)/2ab²
=(-1/2+2/3)/(-1/2x2x4/9)
=(1/6)/(-4/9)
=-3/8