27-13+(-4)-25=______.
125×(4+8)=______×______+______×______.
27-13+(-4)-25=______.
125×32×25=(______×______)×(______×______)
分解因式:2ax+4bx-ay-2by=(______)+(______)=(______)(______).
根据1.2×4=0.6×8,可以写成比例______:______=______:______.
从36的约数中选出4个数组成比例:______:______=______:______.
27046=2×______+7×______+4×______+6×______.
在计算890÷(189-25×4)时,应先算______再算______最后算______.
按规律填数(1)1,3,9,27,81,______,______.(2)1,4,9,16,______,______,
(1)39.56°=______°______′______″(2)65°25′12″=______°.
根据算式25×3=75,______和______是______的因数;______是______和______的倍数.
填质数:21=______+______=______×______=______-______.