问题 填空题
(-1)(-2)-(-3)(-4)-(-5)(-6)-(-7)(-8)
(-1)(-2)-(-2)(-3)-(-3)(-4)-(-4)(-5)
=______.
答案

原式=

2-12-30-56
2-6-12-20
=
-96
-36
=
8
3

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