“*”表示一种新运算，它的意义是a*b=-a×b-（a+b）

3*5=-3x5-(3+5)=-15-8=-23
(-3)*(-5)=-(-3)x(-5)-[(-3)+(-5)]=-15-(-8)=-7

3*5 = -3×5-(3+5)
= -15-8
= -23

(-3)*(-5) = 3×(-5) - (-3-5)
= -15 + 8
= -7

3*5 = -3×5-(3+5)
= -15-8
= -23

(-3)*(-5) = 3×(-5) - (-3-5)
= -15 + 8
= -7

3*5=-3×5-(3+5)=-7
（-3）*（-5）=3×(-5)-((-3)+(-5))=-7

1、-23
2、-7

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