2,3,6,7,14,( ),( ),( )
2,3,6,7,14,( ),( ),( )
因式分解:(1)-4a3b2+10a2b-2ab;(2)6(x+y)2-2(x+y);(3)-7ax2+14axy-7a
简便计算:(1/6-2/7+2/3-3/14)÷(-1/42)
2x/7-(6-5x)/14>3/2最后等于x>3?
计算 0-(-5)-(+6) (+2又7分之3)-(+4又14分之3)-(-2又14分之3)
找规律 3,2,1,7,6,5,4,10,9,8,14,13,12,11()()()()()()()
找规律:1,2,4,6,7,10,10,14,13,18,(),() 还有:1,3,7,15,31,( ) ,(
你能发现什么规律1,2,4,6,7,10,10,14,( ),( )1,3,7,15,31,( ),( )1分之2,4分
1 2 3 4 5 6 7 8 9=14 (填加减符号)
[(1/8-1/6)*24】的三次方-(7/24-14/15)*3/2
24点:(1)2 6 7 28 (2)8 8 9 17 (3)2 10 17 17 (4)3 9 14 21
(1×2×3+2×4×6+4×8×12+7×14×21)÷(1×3×5+2×6×10+4×12×20+7×21×35)