1. 12-22+32-42+52-62…-1002+1012
=12-22+32-42+52-62…-1002+1012
=12+10+10+10+10+…+10(50个10)
=12+500=512
2. 363除以411乘173除以121乘411除以173
=(363/411)乘(173/121)乘(411/173)
=363/121=3
1. 12-22+32-42+52-62…-1002+1012
=12-22+32-42+52-62…-1002+1012
=12+10+10+10+10+…+10(50个10)
=12+500=512
2. 363除以411乘173除以121乘411除以173
=(363/411)乘(173/121)乘(411/173)
=363/121=3