a=-2时,a+2a+3a+4a+.+100a等于多少
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a=-2时,a+2a+3a+4a+.+100a等于多少
![a=-2时,a+2a+3a+4a+.+100a等于多少](/uploads/image/z/19364965-61-5.jpg?t=a%3D-2%E6%97%B6%2Ca%2B2a%2B3a%2B4a%2B.%2B100a%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91)
a+2a+3a+4a+.+100a
=(1+2+3+4+……+100)a
=[(1+100)×100/2]a
=5050a
=5050×(-2)
=-10100
=(1+2+3+4+……+100)a
=[(1+100)×100/2]a
=5050a
=5050×(-2)
=-10100