-1-2-3-4-…-100=______.
科学探究的基本方法:1、______,2、______,3、______,4、______.
-1-2-3-4-…-100=______.
1×2+2×3+…+100×101=______.
找规律填数:1,3,2,6,4,______,______,12,16,….
27046=2×______+7×______+4×______+6×______.
125×(4+8)=______×______+______×______.
(1-2)(3-4)(5-6)…(99-100)=______.
1+2-3+4-5+…-99+100=______.
1+2+3+4+5+6…+100=______.
1+2+…+100﹦______.
(1)34.37°=______度______分______秒. (2)3
5000-2-4-6…-98-100=______.