1+13/6+37/12+81/20+151/30+253/42+393/56+577/72【简算】

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1+13/6+37/12+81/20+151/30+253/42+393/56+577/72【简算】
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1+13/6+37/12+81/20+151/30+253/42+393/56+577/72【简算】
1+13/6+37/12+81/20+151/30+253/42+393/56+577/72【简算】

1+13/6+37/12+81/20+151/30+253/42+393/56+577/72【简算】
1+13/6+37/12+81/20+151/30+253/42+393/56+577/72
=1+2+1/6+3+1/12+4+1/20+5+1/30+6+1/42+7+1/56+8+1/72
=1+2+3+4+5+6+7+8+9+1/6+1/12+1/20+1/30+1/42+1/56+1/72
=(1+9)x9÷2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9
=45+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=45+1/2-1/9
=45+7/18
=45又7/18

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3+13/6+37/12+81/20+151/30+253/42+393/56+577/72
=3+2+1/6+3+1/12+4+1/20+5+1/30+6+1/42+7+1/56+8+1/72
=3+2+3+4+5+6+7+8+1/6+1/12+1/20+1/30+1/42+1/56+1/72
=3+(2+8)*7/2+1/2*3+1/3*4+1/4*5+1/5*6+1/...

全部展开

3+13/6+37/12+81/20+151/30+253/42+393/56+577/72
=3+2+1/6+3+1/12+4+1/20+5+1/30+6+1/42+7+1/56+8+1/72
=3+2+3+4+5+6+7+8+1/6+1/12+1/20+1/30+1/42+1/56+1/72
=3+(2+8)*7/2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9
=3+35+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=38+1/2-1/9
=38+7/18
=38又7/18

收起

1+13/6+37/12+81/20+151/30+253/42+393/56+577/72
=1+2+3+4+5+6+7+8+1/6+1/12+1/20+1/30+1/42+1/56+1/72
=(1+8)*4+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)
=36+(1/2-1/9)
=36又7/18

1+13/6+37/12+81/20+151/30+253/42+393/56+577/72
=1+2+1/6+3+1/12+4+1/20+5+1/30+6+1/42+7+1/56+8+1/72
=1+2+3+4+5+6+7+8+9+1/6+1/12+1/20+1/30+1/42+1/56+1/72
=1+(2+9)*8/2+1/2*3+1/3*4+1/4*5+1/5*6+...

全部展开

1+13/6+37/12+81/20+151/30+253/42+393/56+577/72
=1+2+1/6+3+1/12+4+1/20+5+1/30+6+1/42+7+1/56+8+1/72
=1+2+3+4+5+6+7+8+9+1/6+1/12+1/20+1/30+1/42+1/56+1/72
=1+(2+9)*8/2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9
=1+44+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=45+1/2-1/9
=45+9/18-2/18
=45+7/18
=45又7/18

收起

1+13/6+37/12+81/20+151/30+253/42+393/56+577/72
=1+2+1/6+3+1/12+4+1/20+5+1/30+6+1/42+7+1/56+8+1/72
=1+2+3+4+5+6+7+8+1/6+1/12+1/20+1/30+1/42+1/56+1/72
=(1+8)*8/2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*...

全部展开

1+13/6+37/12+81/20+151/30+253/42+393/56+577/72
=1+2+1/6+3+1/12+4+1/20+5+1/30+6+1/42+7+1/56+8+1/72
=1+2+3+4+5+6+7+8+1/6+1/12+1/20+1/30+1/42+1/56+1/72
=(1+8)*8/2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9
=36+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=36+1/2-1/9
=36+9/18-2/18
=36+7/18
=36又7/18

收起

1+2+1/6+3+1/12+4+1/20+5+1/30+6+1/42+7+1/56+8+1/72=36又18分之7

1+13/6+37/12+81/20+151/30+253/42+393/56+577/72【简算】 3/2+13/6+37/12+81/20+151/30+253/42+393/56+577/72等于几 3+13/6+37/12+81/20+151/30+253/42+393/56+577/72+811/90怎样简算? 3/2+13/6+37/12+81/20+151/30+253/42+393/56简便运算我只剩这一题了 3/2+13/6+37/12+81/20+151/30+253/42+393/56+577/72+730/81+1101/110怎么简便运算 1/6+1/12+1/20+1/30+1/42+1/56++1/72+1/81+1/90 求教几道数字排列题1.3/2 5/6 7/9 9/20 ( )2.31 37 41 43 ( ) 533.1 2 2 3 4 6 ( )4.7 9 40 41 ( ) 1225.2 12 12 30 ( )6.2 3 13 175 ( )7.1 32 81 64 25 ( ) 18.-2 -8 0 64 ( )9.3 7 16 107 ( )10.1 3 4 1 9 ( )11.0 9 26 65 124 ( )12.0 2 10 30 ( )就这 (1)-20+(-14)-(-18)-13 (2)-81÷|-4分之9|×9分之4÷(-16(1)-20+(-14)-(-18)-13(2)-81÷|-4分之9|×9分之4÷(-16)(3)【30-(9分之7+6分之5-12分之11)×(-36)】÷(-5)(4)-4+[1-(1-0.5÷3)]×|2-(-3)^2| 1,2,3,6,11,20,37,( ) . 1,2,3,6,11,20,37,( ) . 1/2+1/4+1/8+1/16+1/32+1/64 7/6+37/12+101/20+211/30+379/421/3+1/6+1/10+1/15+1/21+1/28+1/36+1/451/2+1+3/2+2+5/2+...+301+11/2+55/6+157/12+341/20+631/30+1051/423/2-5/6+7/12-9/20+11/30-13/42 1/2+1/6+1/12+1/20+1/30=简算13/5*8*8/13*125简算 1 2 3 4 5 12 13 18 20 37 42 51 60 69 83里,80的因数有? 1 2 3 4 5 12 13 18 20 37 42 51 60 69 83这些数哪些是合数? 因式分解 39×37-13×81 利用因式分解计算:(1)39×37－13×81; (2)29×20.1＋72×20.1＋利用因式分解计算:(1)39×37－13×81; (2)29×20.1＋72×20.1＋13×20.1－20.1×14 1+3+4+6+7+9+10+12+13+……+36+37+39+40怎么算,谢谢. 数字推理,1/2 ,7/9 ,13/16 ,19/23 ,5/6 ,（ ）A:31/37 B:11/12C:33/37D:10/11应该选什么?