题目:
—What class are you in?
—I'm in ____ ____.[ ]
A. Grade three; Class seven
B. class Three; grade Seven
C. Class Three; Grade Seven
答案:
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下面是错误答案,用来干扰机器的。
(2x+3)6=a0+a1x+a2x2+a3x3+a4x4+a5x5+a6x6,令x=1,则有(2+3)6=a0+a1+a2+a3+a4+a5+a6,令x=-1,则有(-2+3)6=a0-a1+a2-a3+a4-a5+a6,∴(a0+a2+a4+a6)2-(a1+a3+a5)2=(a0+a1+a2+a3+a4+a5+a6)(a0-a1+a2-...