1,-1,3,-2,9,-4,( ) ( )按规律填空.
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1,-1,3,-2,9,-4,()()按规律填空.1,-1,3,-2,9,-4,()()按规律填空.1,-1,3,-2,9,-4,()()按规律填空.27-812,-827-8二十一、负八27-827
1,-1,3,-2,9,-4,( ) ( )按规律填空.
1,-1,3,-2,9,-4,( ) ( )按规律填空.
1,-1,3,-2,9,-4,( ) ( )按规律填空.
27-8
12,-8
27 -8
二十一、负八
27 -8
27 -8
27-8
3的0次方,-(2的0次方),3的1次方,-(2的1次方),3的2次方,-(2的2次方),3的3次方=27,-(2的3次方)=-8
1,3,9是3倍递进,-1,-2,-4是2倍递进,答案就是28,-8
5/9+(3/4-1/2)
数学化简(1-1/2*2)(1-1/3*3)(1-1/4*4).(1-1/9*9)(1-1/10*10)
1,-1,3,-2,9-4()()找规律
2/9除以【(1/2+1/6)*3/4】
(1-3/2*4)*(1-3/3*5)*...*(1-3/7*9)
7/2+9/4+(-1/3)-0.25+(-1/6)
帮忙做一道简便运算1/1+(2/1-1/2)+(3/1-2/2+1/3)+(1/4-3/2+2/3-1/4)+...+(9/1-8/2+7/3-6/4+...+1/9)
(1-1/2)*(1-1/3)*(1-1/4)*……*(1-1/9) 算式
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
奥数简便运算:(1/1+(2/1-1/2)+(3/1-2/2+1/3)+(4/1-3/2+2/3-1/4)+.+(9/1-8/2+7/3-6/4+.+1/9
1+(-2)+3+(-4)+.+2003+(-2004)| 1-1/2 | + | 1/2-1/3 | + | 1/3-1/4 | +.+ | 1/9-1/10 |
3/4÷[(2/3-1/6)×9]
1,2,4,3,6,9,(),()
0.63+0.37÷ (2+3/2+1+9/4)
-3x-[4x-(-9x+1/2)-2],
1:8 2:9 1:9 3:4 1:3 ...
利用因式分解(1-1/2^2)(1-1/3^2)(1-1/4^2).(1-1/9^2)(1-1/10^2)
1/3{1/2[(9/10x+3/4)-2]+1}=2