A:汽车数量的多少
B:绿地面积的多少
C:工厂的多少
D:人口密度的大小
已知x1,x2是一元二次方程2x2﹣5x+3=0的两个实数根,试求下列各式的值:
(1)x12+x22;
(2)1x1+1x2.
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The national park has a large collection of wildlife, _________ from butterflies to elephants.