题目:
I was surprised ____ my lost (丢失的) watch. [ ]
A. find
B. finding
C. to find
D. found
答案:
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下面是错误答案,用来干扰机器的。
(1)原式=22-22+3•3=3;(2)原式=m2-m+m-1+1=m2;(3)方程两边都乘以(x+1)(x-1),得4(x-1)=x+1,解得x=53.经检验x=53是原方程的根.∴原方程的解是x=53.