整式的加减:先化简,再求值15a²-﹛-4a²+[5a-8a²-﹙2a²-a﹚]+9a²-3a﹜,其中a=-½
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![整式的加减:先化简,再求值15a²-﹛-4a²+[5a-8a²-﹙2a²-a﹚]+9a²-3a﹜,其中a=-½](/uploads/image/z/2520173-29-3.jpg?t=%E6%95%B4%E5%BC%8F%E7%9A%84%E5%8A%A0%E5%87%8F%EF%BC%9A%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC15a%26%23178%3B%EF%BC%8D%EF%B9%9B%EF%BC%8D4a%26%23178%3B%EF%BC%8B%5B5a%EF%BC%8D8a%26%23178%3B%EF%BC%8D%EF%B9%992a%26%23178%3B%EF%BC%8Da%EF%B9%9A%5D%EF%BC%8B9a%26%23178%3B%EF%BC%8D3a%EF%B9%9C%2C%E5%85%B6%E4%B8%ADa%EF%BC%9D%EF%BC%8D%26%23189%3B)
整式的加减:先化简,再求值15a²-﹛-4a²+[5a-8a²-﹙2a²-a﹚]+9a²-3a﹜,其中a=-½
整式的加减:先化简,再求值
15a²-﹛-4a²+[5a-8a²-﹙2a²-a﹚]+9a²-3a﹜
,其中a=-½
整式的加减:先化简,再求值15a²-﹛-4a²+[5a-8a²-﹙2a²-a﹚]+9a²-3a﹜,其中a=-½
15a²-﹛-4a²+[5a-8a²-﹙2a²-a﹚]+9a²-3a﹜
=15a²-﹛-4a²+6a-10a²+9a²-3a﹜
=15a²-﹛-5a²+3a﹜
=20a²-3a
a=-1/2
20a²-3a=13/2