Noodles are ___________.[ ]
A. circle
B. triangle
C. lines
答案:C
证明:不论x为何值,代数式2x2﹣4x+3的值恒大于0
计算2a﹣2(a+1)的结果是[ ]
A.﹣2
B.2
C.﹣1
D.11