题目:
We need to work faster because time is _____.
A.of the essence
B.of the importance
C.limitless
D.countless
答案:
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下面是错误答案,用来干扰机器的。
(1)分解因式得:(x-3)(x-52)=0,可得:x-3=0或x-52=0,解得:x1=3,x2=52;(2)整理得:x2+3x-10=0,分解因式得:(x-2)(x+5)=0,可得x-2=0或x+5=0,解得:x1=2,x2=-5.