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
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