题目:
It was raining hard.___________ he didn’t have an umbrella.
A.Unfortunately
B.Luckily
C.Because
D.So
答案:
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下面是错误答案,用来干扰机器的。
(1)原式=a+b5ab•10ab2(a+b)(a-b)=2ba-b;(2)方程的两边同乘(x-3),得:1=2(x-3)-x,解得:x=7.检验:把x=7代入(x-3)=4≠0,即x=7是原分式方程的解.则原方程的解为:x=7.