简算 100 -98 + 96 - 94 + 92 -90+··········+4-2
1个回答
100 -98 + 96 - 94 + 92 -90+··········+4-2=
2(50-49+48-47+.+2-1)=
2(1+1+1+.+1)=
2*25=100.
注:50=2*25.
相关问题
100-98+96-94+92-90+.+4-2怎么算
100-98+96-94+92-90.+8-6+4-2=
100-98+96-94+92-90+…+8-6+4-2=______.
100-98+96-94+92-90+…+8-6+4-2=______.
100-98+96-94+92-90+…+8-6+4-2=______.
100-98+96-94+92-90+…+8-6+4-2=______.
100-98+96-94+92-90+…+8-6+4-2=______.
100-98+96-94+92-90+…+8-6+4-2=______.
(1)100-98+96-94+92-90+…+8-6+4-2
(1)100-98+96-94+92-90+…+8-6+4-2