若ab是有理数,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).
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![若ab是有理数,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).](/uploads/image/z/305429-5-9.jpg?t=%E8%8B%A5ab%E6%98%AF%E6%9C%89%E7%90%86%E6%95%B0%2C%E5%AE%9A%E4%B9%89%E6%96%B0%E8%BF%90%E7%AE%97%E2%96%B3%EF%BC%9Aa%E2%96%B3b%3D2ab-1%2C%E4%BE%8B%E5%A6%82%2C%EF%BC%88-3%EF%BC%89%E2%96%B34%3D2%C3%97%EF%BC%88-3%EF%BC%89%C3%974-1%3D-25%2C%E8%AF%95%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%893%E2%96%B3%EF%BC%88-5%EF%BC%89%EF%BC%9B+++++++++%EF%BC%882%EF%BC%89%5B3%E2%96%B3%EF%BC%88-5%EF%BC%89%5D%E2%96%B3%EF%BC%88-2%EF%BC%89.)
若ab是有理数,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).
若ab是有理数,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).
若ab是有理数,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).
(1)3△(-5)
= 2 × 3 × (-5) - 1(a*b=2ab-1,数与数之间的关系式)
= -31
(2)
[3△(-5)]△(-2)
= (-31)△(-2)
= 2 × (-31) × (-2) - 1
= 124 - 1
= 123
我是通过以下以题解答出你的问题的,
若a/b是有理数,定义新运算“*”a*b=2ab+1,例如:{-3}*4=2*4+1=23试计算:{1}3*{-5}{2}{6*{-7}
3△(-5)=2*3*-5-1=-31
)[3△(-5)]△(-2)=-31△(-2)=2*(-31)*(-2)-1=123
你好:
(1)3△(-5)=2*3*(-5)-1 =-31
(2)[3△(-5)]△(-2)=2*[2*3*(-5)-1]*(-2)-1 = 123
(1)=2*3*(-5)-1=-31 ;(2)=2*-31*(-2)-1=123
若a/b是有理数,定义新运算“*”a*b=2ab 1,例如:{-3}*4=2*4 1=23试计算:{1}3*{-5}{2}{6*{-7}}*{-2} {1} 3*
(1)、2×3×(-5)-1=-31
(2)、根据上一题结果,2×(-31)×(-2)-1=123
(1)
3△(-5) = 2 × 3 × (-5) - 1 = -31
(2)
[3△(-5)]△(-2)
= (-31)△(-2)
= 2 × (-31) × (-2) - 1
= 124 - 1
= 123