14+13+12+11+10+9+8+7+6+5+4+3+2+1
=(14+1)x14除以2
=15x14除以2
=210除以2
=105
猜你喜欢
- 11.some of the men have smoked for more than twenty years(改为同义句)some of the men have smoked for ()twenty years 2.the Beat
- 2如图,在△ABC中,∠B=90°,M为AB上一点,使得AM=BC,N为BC上一点,使得CN=BM,连接AN,CM相交于点P,试求∠APM的度数.
- 3she has an elder brother.变为疑问句
- 4汽车油耗怎么计算,
- 5A bowl of noodles with orange juice ___ only 1.5 yuan
- 6英语翻译
- 7括号添上分数 79立方分米=( )立方米 15毫升=( )升
- 8There _____ some milk,two apples on the table.
- 9水果店运来苹果和梨两种水果苹果千克数的的1/2等于梨千克数的2/3,苹果千克数的3/4比梨千克数的5/6多750KG
- 10It's much colder today than___yesterday