20082-20072+20062-20052+…+22-12=______.
20082-20072+20062-20052+…+22-12=______.
202-192+182-172+…+22-12=______.
125×(4+8)=______×______+______×______.
观察:-20042,20052,-20062,20072,…,第n个数是______.
填质数:21=______+______=______×______=______-______.
11+12+13+14+15=______×______.
22.5°=______度______分;12°24′=______度.
小数的计数单位是______、______、______….
3.76°=______度 ______分 ______秒.
15+22+29+…+2003+2010=______.
填上适当的质数.24=______+______=______+______=______+______.
巧填单位名称.1______-59______=1______;1______-9______=1______;1___