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定义新运算e为xey=2xy-(x+y),求12e(3e4)
人气:322 ℃ 时间:2019-12-09 11:22:01
解答
3e4
= 2*3*4 - (3 + 4)
= 24 - 7
= 17
12e(3e4)
= 12 e 17
= 2*12*17 - (12 + 17)
= 408 - 29
= 379
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