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已知a,b为有理数定义新运算△:a△b=2ab-1例如,(-3)△4=2×(-3)×4-1=-25,
试计算:
(1)3△(-5); (2)[3△(-5)]△(-2).
人气:268 ℃ 时间:2019-11-01 10:49:43
解答
(1)3△(-5)
=2x3x(-5)-1
=-30-1
=-31
(2)[3△(-5)]△(-2)
=(-31)△(-2)
=2x(-31)(-2)-1
=62x2-1
=124-1
=123
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