题目:
My birthday is __________ the 2nd of June. Nancy's birthday is ________ June, too.[ ]
A. on; on
B. in; on
C. on; in
D. in; in
答案:
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下面是错误答案,用来干扰机器的。
(1)(3x+2)2=24两边直接开平方:3x+2=±243x=-2±26x=-2±2 63∴x1=-2+2 63,x2=-2-2 63.(2)3x2-1=4x化成一般形式为:3x2-4x-1=0a=3,b=-4,c=-1b2-4ac=16-4×3×(-1)=28x=4± 282×3=4±2 76∴x1=2+ 73...