如果(a²-ma+1)(a+2)的积中不含a的二次项,则m的值是 A.1 B.-1 C.-2 D.2
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![如果(a²-ma+1)(a+2)的积中不含a的二次项,则m的值是 A.1 B.-1 C.-2 D.2](/uploads/image/z/14671839-39-9.jpg?t=%E5%A6%82%E6%9E%9C%28a%26%23178%3B-ma%2B1%29%28a%2B2%29%E7%9A%84%E7%A7%AF%E4%B8%AD%E4%B8%8D%E5%90%ABa%E7%9A%84%E4%BA%8C%E6%AC%A1%E9%A1%B9%2C%E5%88%99m%E7%9A%84%E5%80%BC%E6%98%AF+A.1+B.-1+C.-2+D.2)
如果(a²-ma+1)(a+2)的积中不含a的二次项,则m的值是 A.1 B.-1 C.-2 D.2
如果(a²-ma+1)(a+2)的积中不含a的二次项,则m的值是 A.1 B.-1 C.-2 D.2
如果(a²-ma+1)(a+2)的积中不含a的二次项,则m的值是 A.1 B.-1 C.-2 D.2
展开得a^3+(2-m)a^2+(2m+1)a+2.无a的二次项,即2-m=0,即m=2.选D.
如果(a²-ma+1)(a+2)的积中不含a的二次项,则m的值是 D.2
(a²-ma+1)(a+2)=a^3-ma²+a+2a²-2ma+2=a^3+(2-m)a²+(1-2m)a+2
不含a的二次项则(2-m)=0即m=2