(5+7)×2+17
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(5+7)×2+17
(5+7)×2+17
(5+7)×2+17
41
(5+7)×2+17
17-(4/5+42×2/7)
找规律,2,1,5,7,17,(),(),127
2,3,5,7,11,(),17,19 找规律
按规律填空:2,3,5,7,(),13,17
简算 (2+3+1/5)+(2/3-5/17)-(1/5+12/7)
简便运算:(1 16/17+2 7/13+4 5/7)÷(3/7+3/13+3/17)
5/2 7/5 1 14/17 ( )
计算:17/30×31-17/30=?8/9÷【2/5×(2/7×5/2)】=?
(51-17/3)*3/17简便方法,7/17*5/28+7/17*23/28
2/5*()=17/7*()=12/5*()
写出它们的规律;(1) -1,-7,5,-19,29,-67,. (2) 2,-1,5,-7,17,-31,...
(-18)+(+17)+(-19)+13+(-11) (-5/2)+(5/6)+(0.5)+(+7(-18)+(+17)+(-19)+13+(-11)(-5/2)+(5/6)+(0.5)+(+7/6)(+1/7)+(-4/3)+(-4/5)+(-1/7)+(+1/4)+(+4/5)|-13|+|+87|+|-23|+|-17|
数学简便计算;(+15/17)+(-2.5)+(-5)+(+2.5)+2/17(+15/17)+(-2.5)+(-5)+(+2.5)+2/171/6+(-2/7)+(-5/6)+(+5/7)(-3/2)+(-5/12)+(5/2)+(-7/12)(-21)+(-19)+(+12)+(+5)(-23)+72+(-31)+(+47)(-1.6
数字推理题 ( ),17/14,1,5/7,2/5,1/4
8/25*2/7+8/25*3/7+17/25*5/7=()(用简便方法计算)
找规律写数2,3,5,7,11,13,( ),( )21,2,19,5,17,8,( ),( )
17/5×7/9+2/17×5/9+8/17×5/9 简便计算