2-0.2-0.02-0.002-…-0.0000000002=______.
27046=2×______+7×______+4×______+6×______.
125×(4+8)=______×______+______×______.
填质数:21=______+______=______×______=______-______.
找规律,填一填.0.2、0.6、1.8、______、16.2、______、______…..
分解因式:2ax+4bx-ay-2by=(______)+(______)=(______)(______).
小数的计数单位是______、______、______….
3.76°=______度 ______分 ______秒.
填上适当的质数.24=______+______=______+______=______+______.
巧填单位名称.1______-59______=1______;1______-9______=1______;1___
1×2+2×3+…+100×101=______.
-1-2-3-4-…-100=______.
5000-2-4-6…-98-100=______.