(*)表示一種新的運算,它的意義是a(*)b=-a*b-(a+b)
題目:
(*)表示一種新的運算,它的意義是a(*)b=-a*b-(a+b)
(1)求(-2)(*)(-3)
(2)求(3(*)4)(*)(-5)
解答:
(1)(-2)(*)(-3)
= -(-2)*(-3)-(-2-3)
= -6+5
= -1
(2)(3(*)4)(*)(-5)
= [-3*4 -(3+4)](*)(-5)
=(-12-7)(*)(-5)
=(-19)(*)(-5)
= -(-19)*(-5)-(-19-5)
= -95+24
= -71
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