1×2+2×3+…+100×101=______.
1×2+2×3+…+100×101=______.
科学探究的基本方法:1、______,2、______,3、______,4、______.
-1-2-3-4-…-100=______.
1+2+…+100﹦______.
(1)34.37°=______度______分______秒. (2)3
1微米=______米=______厘米=______分米=______毫米;1毫米2=______;1米3=_____
21.035里面有2个______,1个______,3个______和5个______,它的计算单位是______.
找规律填数:1,3,2,6,4,______,______,12,16,….
27046=2×______+7×______+4×______+6×______.
100+99-98+97-96+…+3-2+1=______.
(1-2)(3-4)(5-6)…(99-100)=______.
1+2-3+4-5+…-99+100=______.