3+13/6+37/12+81/20+151/30+253/42+393/56+577/72+811/90怎样简算?

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3+13/6+37/12+81/20+151/30+253/42+393/56+577/72+811/90怎样简算?

3+13/6+37/12+81/20+151/30+253/42+393/56+577/72+811/90怎样简算?
3+13/6+37/12+81/20+151/30+253/42+393/56+577/72+811/90怎样简算?

3+13/6+37/12+81/20+151/30+253/42+393/56+577/72+811/90怎样简算?
3+13/6+37/12+81/20+151/30+253/42+393/56+577/72+811/90
=3+2+1/6+3+1/12+4+1/20+5+1/30+6+1/42+7+1/56+8+1/72+9+1/90
=3+2+3+4+5+6+7+8+9+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
=3+(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+1/9*10
=3+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+1/9-1/10
=47+1/2-1/10
=47+5/10-1/10
=47+2/5
=47又2/5

3+13/6+37/12+81/20+151/30+253/42+393/56+577/72+811/90
=3+(2+1/6)+(3+1/12)+(4+1/20)+(5+1/30)+(6+1/42)+(7+1/56)+(8+1/72)+(9+1/90)
=2+(1+2+3+...+9)+(1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90)
=2...

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3+13/6+37/12+81/20+151/30+253/42+393/56+577/72+811/90
=3+(2+1/6)+(3+1/12)+(4+1/20)+(5+1/30)+(6+1/42)+(7+1/56)+(8+1/72)+(9+1/90)
=2+(1+2+3+...+9)+(1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90)
=2+45+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)+1/(9*10)
=47+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+....+(1/8-1/9)+(1/9-1/10)
=47+1/2-1/10
=47+2/5

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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 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,( ) . (答得好给悬赏)3/2+13/6+37/12+85/20+151/30+252/42+392/56 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? (1/2-2/3+5/6-3/4)×(-12) (-8)×(-81/20)×1.25×(-0.1)(1/2-2/3+5/6-3/4)×(-12)(-8)×(-81/20)×1.25×(-0.1) 因式分解 39×37-13×81 1+3+4+6+7+9+10+12+13+……+36+37+39+40怎么算,谢谢. 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 简算脱式计算:1、250×12 2、306×24 3、430×25×4 4、4×9×2505、125×3×8 6、15×4×25×6 7、65×99 8、45×(20+4) 9、99×33 10、23+56+77+144 11、246+98 12、126×8+74×8 13、25×93+25×7 14、18×25×40 15、144×37-44×37 简算16-12×8分之361×4分之3-4分之3×20-4分之3(3分之1+4分之3+6分之5)×122.6×2.3×13分之225分之17×37分之5+25分之8×37分之17+37分之17×25分之27×15分之8-7×35分之12+7×63分之19-99分之20×7还有一个:26×