1.Tính nhanh
(1+2+3+............+50)×(131313×34-13×343434)
Những câu hỏi liên quan
tìm x biết:
a/ 3/2*x-70/10/11:(131313/151515+131313/353535+131313/999999)=-5
b/ 0,25*x*(8/5:1/1/2+1/50)=7/50*(2,91+0,09)*4
c/ (2/11*13+2/13*15+...+2/19*21) *462-(0,04:(x + 1,05)):0,12=19
tinh nhanh
a) A=(-1).(-1)^2.(-1)^3.(-1)^4....(-1)^2010.(-1)^2011
b) B=70.(131313/565656+131313/727272+131313/909090)
d)D= -1/20+ -1/30+ -1/42+ -1/56+ -1/72+ -1/90
e) E= 5/2.1+4/1.11+3/11.2+1/2.15+13/15.4
bài 1:18*(191919/212121+88888/99999)=?
bài 2:13*(3434/3535+343434/6565650=?
giải giúp mk nhanh nha cảm ơn!
có thể gửi trước ngày 14/3/2017 dc ko???
Giải
Bài A) \(\frac{191919}{212121}\)+ \(\frac{88888}{99999}\)= \(\frac{133}{63}\)
Bài B) \(\frac{3434}{3535}\)+ \(\frac{343434}{6565650}\)= \(\frac{2329}{2275}\)^0^
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Cho mình trả lời lại >0<
A) 18 x( \(\frac{191919}{212121}\)+ \(\frac{88888}{99999}\))= \(\frac{226}{7}\)
B) 13 x (\(\frac{3434}{3535}\)+ \(\frac{343434}{6565650}\))=\(\frac{2329}{175}\) Sorry bạn nhiều ^0^
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d,left(frac{1}{6}+2frac{1}{12}-10,75right).x-7left(frac{2}{5}+frac{3}{8}+0,225right):0,1c,1-left(5frac{3}{8}+x-7frac{5}{24}right):16frac{2}{3}0e,frac{3}{2}x-70frac{10}{11}:left(frac{131313}{151515}+frac{131313}{353535}+frac{131313}{636363}+frac{131313}{999999}right)-5f,0,25xleft(frac{8}{5}:1frac{1}{2}+frac{1}{50}right)frac{7}{50}left(2,91+0,09right).4ai làm nhanh và đúng mk tick cho
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\(d,\left(\frac{1}{6}+2\frac{1}{12}-10,75\right).x-7=\left(\frac{2}{5}+\frac{3}{8}+0,225\right):0,1\)\(c,1-\left(5\frac{3}{8}+x-7\frac{5}{24}\right):16\frac{2}{3}=0\)
\(e,\frac{3}{2}x-70\frac{10}{11}:\left(\frac{131313}{151515}+\frac{131313}{353535}+\frac{131313}{636363}+\frac{131313}{999999}\right)=-5\)\(f,0,25x\left(\frac{8}{5}:1\frac{1}{2}+\frac{1}{50}\right)=\frac{7}{50}\left(2,91+0,09\right).4\)
ai làm nhanh và đúng mk tick cho
Tính nhanh:
a)\(\frac{131313}{151515}+ \frac{131313}{353535}+\frac{131313}{636363}+\frac{131313}{999999}\)
b)\(\frac{1}{1\times2}+\frac{1}{2\times3}+\frac{1}{3\times4}+...+\frac{1}{2017\times2018}\)
c)\(\frac{1}{3\times5}+\frac{1}{4\times7}+\frac{1}{7\times9}+...\frac{1}{2015\times2017}+\frac{1}{2017\times2018}\)
\(a,\frac{131313}{151515}+\frac{131313}{353535}+\frac{131313}{636363}+\frac{131313}{999999}\)
\(=\frac{13}{15}+\frac{13}{35}+\frac{13}{63}+\frac{13}{99}\)
\(=13\left(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+\frac{1}{7.9}\right)\)
\(=13\left(\frac{1}{3}-\frac{1}{9}\right)\)
\(=13.\frac{2}{9}=\frac{26}{9}\)
\(b,\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{2017.2018}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{2017}-\frac{1}{2018}\)
\(=1-\frac{1}{2018}=\frac{2017}{2018}\)
P/s :Dấu chấm là dấu nhân nha
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\(\frac{131313}{151515}+\frac{131313}{353535}+\frac{131313}{636363}+\frac{131313}{999999}\)
\(=\frac{13.10101}{15.10101}+\frac{13.10101}{35.10101}+\frac{13.10101}{63.10101}+\frac{13.10101}{99.10101}\)
\(=13.\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{63}+\frac{1}{99}\right)\)
\(=\frac{13}{2}.\left(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+\frac{2}{9.11}\right)\)
\(=\frac{13}{2}.\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+\frac{1}{9}-\frac{1}{11}\right)\)
\(=\frac{13}{2}.\left(\frac{1}{3}-\frac{1}{11}\right)\)
\(=\frac{13}{2}.\left(\frac{11}{33}-\frac{3}{33}\right)\)
\(=\frac{13}{2}.\frac{8}{33}\)
\(=\frac{52}{33}\)
\(\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{2017.2018}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{2017}-\frac{1}{2018}\)
\(=1-\frac{1}{2018}\)
\(=\frac{2017}{2018}\)
Sửa đề chút:
\(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+...+\frac{1}{2015.2017}+\frac{1}{2017.2018}\)
\(=\frac{1}{2}.\left(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+...+\frac{2}{2015.2017}\right)+\frac{1}{2017}-\frac{1}{2018}\)
\(=\frac{1}{2}.\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{2015}-\frac{1}{2017}\right)+\frac{1}{2017}-\frac{1}{2018}\)
\(=\frac{1}{2}.\left(\frac{1}{3}-\frac{1}{2017}\right)+\frac{1}{2017}-\frac{1}{2018}\)
B tự làm nốt nhé
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Áp dụng tính chất của phép nhân phân số để tính nhanh
a,17/23.18/16.23/17-(-80)-3/4
b,5/11.18/29-5/11.8/29+5/11.19/29
c,(13/23+1313/2323-131313/232323).(1/3+1/4-7/12)
a) \(\frac{17}{23}.\frac{18}{16}.\frac{23}{17}-\left(-80\right)-\frac{3}{4}\)
= \(\frac{17.18.23}{23.16.17}+80-\frac{3}{4}\)
= \(\frac{9}{8}+80-\frac{3}{4}\)
= \(\frac{3}{8}+80=\frac{643}{8}\)
b) \(\frac{5}{11}.\frac{18}{29}-\frac{5}{11}.\frac{8}{29}+\frac{5}{11}.\frac{19}{29}\)
= \(\frac{5}{11}.\left(\frac{18}{29}-\frac{8}{29}+\frac{19}{29}\right)\)
= \(\frac{5}{11}.1=\frac{5}{11}\)
c) \(\left(\frac{13}{23}+\frac{1313}{2323}-\frac{131313}{232323}\right).\left(\frac{1}{3}+\frac{1}{4}-\frac{7}{12}\right)\)
= \(\left(\frac{13}{23}+\frac{1313}{2323}-\frac{131313}{232323}\right).0\)
= \(0\)
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tính nhanh
7/12+5/12+2/17
109/17×213/217+3/112+221/217
12/17×21/25×34/12×25/42
25/34×3/13×34/50×26/2
57/20×13/17-17/20×13/17
2006/2007×2/7+1/2007×2/7
khó qua !!!!
phép tính cứ làm bình thường nha nhân chia trước cộng trừ sau , cái gì trung đặt ra ngoài .xin lỗi vì vt hơ mỏi tay nên mik vt lời thôi nha
~ hok tốt ~
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Tính nhanh: 34/50 - 3/8 +1/4
\(\dfrac{34}{50}-\dfrac{3}{8}+\dfrac{1}{4}=\dfrac{34\times4}{200}-\dfrac{3\times25}{200}+\dfrac{50}{200}=\dfrac{136-75+50}{200}=\dfrac{111}{200}\)
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Thực hiện phép tính:a)1times2times3times......times9-1times2times3times......times8-1times2times3times.....times8times8b)Bfrac{left(3times4times2^{16}right)^2}{11times2^{13}times4^{11}-16^9}c)C70timesleft(frac{131313}{565656}+frac{131313}{727272}+frac{131313}{909090}right)d)Bfrac{1}{4times9}+frac{1}{9times14}+frac{1}{14times19}+...+frac{1}{64times69}GIÚP MIK VỚI AI NHANH MIK CHO 3 TICK LUÔN CHO NHA!!!!!!!!!!NHỚ TRÌNH BÀY RÕ RÀNG NHA!!!!!!HELP ME
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Thực hiện phép tính:
a)\(1\times2\times3\times......\times9-1\times2\times3\times......\times8-1\times2\times3\times.....\times8\times8\)
b)\(B=\frac{\left(3\times4\times2^{16}\right)^2}{11\times2^{13}\times4^{11}-16^9}\)
c)\(C=70\times\left(\frac{131313}{565656}+\frac{131313}{727272}+\frac{131313}{909090}\right)\)
d)\(B=\frac{1}{4\times9}+\frac{1}{9\times14}+\frac{1}{14\times19}+...+\frac{1}{64\times69}\)
GIÚP MIK VỚI AI NHANH MIK CHO 3 TICK LUÔN CHO NHA!!!!!!!!!!NHỚ TRÌNH BÀY RÕ RÀNG NHA!!!!!!HELP ME
a)1.2.3.4...9-1.2.3.4...8-1.2.3.4...8.8
=1.2.3.4...8(9-1-8)
=1.2.3.4...8.0
=0
b)(3.4.216)2/11.123.411-169=(3.22.216)2/11.213.222-236=32.24.232/11.235-236=32.226/235.(11-2)
=32.236/235.9=32.236/235.32=2
c)70.(131313/565656+131313/727272+131313/909090
=70.(13/56+13/72+13/90)
=70.39/70=39
d)1/4.9+1/9.14+1/14.19+...+1/64.69
=4/4.9.4+4/9.4.14+4/14.19.4+...+4/64.69.4.
=1/4.(4/4.9+4/9.14+4/14.19+...+4/64.69)
=1/4.(1/4-1/9+1/9-1/14+1/14-1/19+...+1/64-1/69)
=1/4.(1/4-1/69)
=1/4.65/276=65/1104
~~~~~~~~Chúc bạn học giỏi nhé !~~~~~~~~
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d)\(\frac{1}{3}\times\left(\frac{1}{4}-\frac{1}{9}+\frac{1}{9}-\frac{1}{14}+...+\frac{1}{64}-\frac{1}{69}\right)\)
\(\frac{1}{3}\times\left(\frac{1}{4}-\frac{1}{69}\right)\)
\(\frac{1}{3}\times\frac{65}{276}\)
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