求大师解答:已知A=7a²-5a-1,B=-2a²+3a+2,C=4a-a+6.求2A+3B-4C
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![求大师解答:已知A=7a²-5a-1,B=-2a²+3a+2,C=4a-a+6.求2A+3B-4C](/uploads/image/z/683742-30-2.jpg?t=%E6%B1%82%E5%A4%A7%E5%B8%88%E8%A7%A3%E7%AD%94%EF%BC%9A%E5%B7%B2%E7%9F%A5A%3D7a%26%23178%3B-5a-1%2CB%3D-2a%26%23178%3B%2B3a%2B2%2CC%3D4a-a%2B6.%E6%B1%822A%2B3B-4C)
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求大师解答:已知A=7a²-5a-1,B=-2a²+3a+2,C=4a-a+6.求2A+3B-4C
求大师解答:已知A=7a²-5a-1,B=-2a²+3a+2,C=4a-a+6.求2A+3B-4C
求大师解答:已知A=7a²-5a-1,B=-2a²+3a+2,C=4a-a+6.求2A+3B-4C
解析
2A+3B-4C=2(7a²-5a-1)+3(-2a²+3a+2)-4(4a²-a+6)
=14a²-10a-2+(-6a²+9a+6)-(16a²-4a+24)
=14a²-10a-2-6a²-9a-6-16a²+4a-24
=14a²-6a²-16a²-10a-9a+4a-2-6-24
=-8a²-15a--32