1、先化简,再求值:6ab-3[3b²-(a²-2ab)+1],其中a=-2,b=-1/3
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![1、先化简,再求值:6ab-3[3b²-(a²-2ab)+1],其中a=-2,b=-1/3](/uploads/image/z/7103404-28-4.jpg?t=1%E3%80%81%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A6ab-3%5B3b%26%23178%3B-%EF%BC%88a%26%23178%3B-2ab%EF%BC%89%2B1%5D%2C%E5%85%B6%E4%B8%ADa%3D-2%2Cb%3D-1%2F3)
1、先化简,再求值:6ab-3[3b²-(a²-2ab)+1],其中a=-2,b=-1/3
1、先化简,再求值:6ab-3[3b²-(a²-2ab)+1],其中a=-2,b=-1/3
1、先化简,再求值:6ab-3[3b²-(a²-2ab)+1],其中a=-2,b=-1/3
原式=6ab-9b²+3(a²-2ab)-3
=6ab-9b²+3a²-6ab-3
=-9b²+3a²-3
=-1+12-3
=8