1-3+5-7+9-11+13-…-39+41=几
问题描述:
1-3+5-7+9-11+13-…-39+41=几
答
1怎么算啊原式=(1-3)+(5-7)+(9-11)+?+(37-39)+41 =41-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2 =41-40=1
1-3+5-7+9-11+13-…-39+41=几
1怎么算啊原式=(1-3)+(5-7)+(9-11)+?+(37-39)+41 =41-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2 =41-40=1