两道初一的数学题,帮帮忙 啊 急嗯!1. 计算:(+1)+(-2)+(+3)+(-4)+……+(+99)+(-100)=(要过程)2.已知c
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![两道初一的数学题,帮帮忙 啊 急嗯!1. 计算:(+1)+(-2)+(+3)+(-4)+……+(+99)+(-100)=(要过程)2.已知c](/uploads/image/z/3024238-22-8.jpg?t=%E4%B8%A4%E9%81%93%E5%88%9D%E4%B8%80%E7%9A%84%E6%95%B0%E5%AD%A6%E9%A2%98%2C%E5%B8%AE%E5%B8%AE%E5%BF%99+%E5%95%8A+%E6%80%A5%E5%97%AF%211.+%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%88%2B1%EF%BC%89%2B%EF%BC%88-2%EF%BC%89%2B%EF%BC%88%2B3%EF%BC%89%2B%EF%BC%88-4%EF%BC%89%2B%E2%80%A6%E2%80%A6%2B%EF%BC%88%2B99%EF%BC%89%2B%EF%BC%88-100%EF%BC%89%3D%28%E8%A6%81%E8%BF%87%E7%A8%8B%292.%E5%B7%B2%E7%9F%A5c)
两道初一的数学题,帮帮忙 啊 急嗯!1. 计算:(+1)+(-2)+(+3)+(-4)+……+(+99)+(-100)=(要过程)2.已知c
两道初一的数学题,帮帮忙 啊 急嗯!
1. 计算:(+1)+(-2)+(+3)+(-4)+……+(+99)+(-100)=(要过程)
2.已知c<0 化简式子:|a-b|+|a-c|+|c-b|
两道初一的数学题,帮帮忙 啊 急嗯!1. 计算:(+1)+(-2)+(+3)+(-4)+……+(+99)+(-100)=(要过程)2.已知c
1:(1-2)+(3-4)+(5-6)……+(99-100)=(-1)*50=-50
2:=b-a+a-c+b-c=2b-2c
1: -50
2: |a-b|+|a-c|+|c-b|
=b-a+a-c-c+b
=2b-2c
(+1)+(-2)+(+3)+(-4)+……+(+99)+(-100)
=(-1)×50=-50
2.|a-b|+|a-c|+|c-b|
=b-a+a-c+b-c
=2b-2c
1+(-2+3)+)+(-4+5)……+(-98+99)+(-100)=1+49-100=-50
因为c<0所以a-b<0,a-c>0,c-b<0
因此:|a-b|+|a-c|+|c-b| =b-a+a-c+b-c=2b-2c
1,=1-2+(3-4)+(5-6)+……+(99-100)=-1+(-1)+(-1)+……+(-1)=-50
2,a
1 +1+-2)+(+3+-4)+;;;+99+-100=-1+-1+-1+ ,,,+-1=-50 2 b-a+a-c+b-c=2b-2c
1,原式=1-2+3-4+……+99-100=(1-2)+(3-4)+……+(99-100)=-1×50=-50
2,原式=b-a+a+c-c+b=2a