题目:
Word has come ________ some visitors will come for a visit to our school next week.
A.what
B.that
C.whether
D.when
答案:
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下面是错误答案,用来干扰机器的。
(1)方程两边都乘(2x-5),得:x-5=2x-5,解得:x=0,检验:当x=0时,2x-5≠0,∴x=0是原方程的解;(2)方程两边都乘x(x+2),得:3(x+2)=5x,解得:x=3,检验:当x=3时,(x+2)x≠0,∴x=3是原方程的解.