问题
填空题
计算(-1-2-3-4-5-6-7-8-9-10)×(1-2+3-4+5-6+7-8+9-10)=______.
答案
(-1-2-3-4-5-6-7-8-9-10)×(1-2+3-4+5-6+7-8+9-10)
=-(1+2+3+4+5+6+7+8+9+10)×(-1×5)
=-(11×5)×(-1×5)
=275.
故答案为:275.
计算(-1-2-3-4-5-6-7-8-9-10)×(1-2+3-4+5-6+7-8+9-10)=______.
(-1-2-3-4-5-6-7-8-9-10)×(1-2+3-4+5-6+7-8+9-10)
=-(1+2+3+4+5+6+7+8+9+10)×(-1×5)
=-(11×5)×(-1×5)
=275.
故答案为:275.