Решите пжж!!!
(-1)×(-2)+(-3)+(-4)+4+3+2+1=???
(-7)+(-5)+(-3)+(-1)+1+3+5+7=...??
(-10)+(-9)+(-8)+(-7)+...+7+8+9+10=..??
(-100)+(-99)+(-99)+...+98+99+100=..?

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