合并同类项-3a+5a-6a 2ax²-3ax-7ax² 2x²+1-3x+7-3x² 7xy-x²+2x²-5xy-3x²先合并同类项,再求多项式的值 4a²-4a+1-4+12a-9a²,其中a=—1:9a²-12ab+4b²-4a²-12ab-9a²,其中a=1/2,
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![合并同类项-3a+5a-6a 2ax²-3ax-7ax² 2x²+1-3x+7-3x² 7xy-x²+2x²-5xy-3x²先合并同类项,再求多项式的值 4a²-4a+1-4+12a-9a²,其中a=—1:9a²-12ab+4b²-4a²-12ab-9a²,其中a=1/2,](/uploads/image/z/3695688-0-8.jpg?t=%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9-3a%2B5a-6a+2ax%26%23178%3B-3ax-7ax%26%23178%3B+2x%26%23178%3B%2B1-3x%2B7-3x%26%23178%3B+7xy-x%26%23178%3B%2B2x%26%23178%3B-5xy-3x%26%23178%3B%E5%85%88%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9%2C%E5%86%8D%E6%B1%82%E5%A4%9A%E9%A1%B9%E5%BC%8F%E7%9A%84%E5%80%BC+4a%26%23178%3B-4a%2B1-4%2B12a-9a%26%23178%3B%2C%E5%85%B6%E4%B8%ADa%3D%E2%80%941%EF%BC%9A9a%26%23178%3B-12ab%2B4b%26%23178%3B-4a%26%23178%3B-12ab-9a%26%23178%3B%2C%E5%85%B6%E4%B8%ADa%3D1%2F2%2C)
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合并同类项-3a+5a-6a 2ax²-3ax-7ax² 2x²+1-3x+7-3x² 7xy-x²+2x²-5xy-3x²先合并同类项,再求多项式的值 4a²-4a+1-4+12a-9a²,其中a=—1:9a²-12ab+4b²-4a²-12ab-9a²,其中a=1/2,
合并同类项-3a+5a-6a 2ax²-3ax-7ax² 2x²+1-3x+7-3x² 7xy-x²+2x²-5xy-3x²
先合并同类项,再求多项式的值 4a²-4a+1-4+12a-9a²,其中a=—1:9a²-12ab+4b²-4a²-12ab-9a²,其中a=1/2,b=—1/2
合并同类项-3a+5a-6a 2ax²-3ax-7ax² 2x²+1-3x+7-3x² 7xy-x²+2x²-5xy-3x²先合并同类项,再求多项式的值 4a²-4a+1-4+12a-9a²,其中a=—1:9a²-12ab+4b²-4a²-12ab-9a²,其中a=1/2,
(-3+5-6)a=-8a (2-7)ax平方-3ax=-5ax平方-3ax (2-3)x平方-3x+1
(7-5)xy+(-1+2-3)x平方=2xy-2x平方 剩下的等一下发
当a=-1时 (4-9)x(-1)平方+(-4+12)x(-1)+(1-4)=-5-8-3=-16
剩下那题太.太复杂了(看在我辛苦打的份上给好评吧)