(1-2)(3-4)(5-6)…(99-100)=______.
125×(4+8)=______×______+______×______.
(1-2)(3-4)(5-6)…(99-100)=______.
分解因式:2ax+4bx-ay-2by=(______)+(______)=(______)(______).
细胞核的结构(1)_____(2)染色质______(3)核仁______(4)核孔______细胞核的功能______
(1)34.37°=______度______分______秒. (2)3
按律填数.(1分) 1,3,2,6,4,______,______,12,16,…
按规律填数(1)1,3,9,27,81,______,______.(2)1,4,9,16,______,______,
1+3+5+…+99-(2+4+6+…+98)______.
125×32×25=(______×______)×(______×______)
找规律填数.(1)1,4,9,16,______,______,49,64.(2)1,3,2,6,4,______,__
1+(-2)+3+(-4)+5+…+2009+(-2010)=______.
找规律填数:(1)0,1,2,3,______,______.(2)1,1,2,3,______,______.(3)1