题目内容
计算:3(2+1)(2+1)(2+1)-2 的结果为( )
A. 2-1 | B. -1 | C. 2+1 | D. 1 |
B
∵3=2-1
∴3(2+1)(2+1)(2+1)-2
=(2-1)(2+1)(2+1)(2+1)-2
=(28-1)(2+1)-2
=2-1-2
=-1
故选B
∴3(2+1)(2+1)(2+1)-2
=(2-1)(2+1)(2+1)(2+1)-2
=(28-1)(2+1)-2
=2-1-2
=-1
故选B
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