\(-\frac{77}{21}.\frac{8}{9}-\frac{111}{93}\)
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Tính nhanhAfrac{3}{1}* 4 +frac{3}{4}* 7 +frac{3}{7}* 10 +...+frac{3}{205}* 208Bfrac{77}{2}* 9 +frac{77}{9}* 16 +frac{77}{16}* 23 +...+frac{77}{93}* 100Cfrac{7}{1}* 5 +frac{7}{5}* 9 +frac{7}{9}* 13 +frac{7}{13}* 17 +frac{7}{17}* 21Các bạn giúp mình với nha , mình đang cần gấp
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Tính nhanh
A=\(\frac{3}{1}\)* 4 +\(\frac{3}{4}\)* 7 +\(\frac{3}{7}\)* 10 +...+\(\frac{3}{205}\)* 208
B=\(\frac{77}{2}\)* 9 +\(\frac{77}{9}\)* 16 +\(\frac{77}{16}\)* 23 +...+\(\frac{77}{93}\)* 100
C=\(\frac{7}{1}\)* 5 +\(\frac{7}{5}\)* 9 +\(\frac{7}{9}\)* 13 +\(\frac{7}{13}\)* 17 +\(\frac{7}{17}\)* 21
Các bạn giúp mình với nha , mình đang cần gấp
Tìm các số nguyên x,y,z,t,u biết: \(\frac{4}{3}=\frac{12}{9}=\frac{8}{x}=\frac{y}{21}=\frac{40}{z}=\frac{16}{t}=\frac{u}{111}\)
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thực hiện phép tính
a, \(\frac{-5}{21}+\frac{2}{9}\)
b, \(\frac{-4}{21}-\frac{5}{12}\)
c,\(\frac{6}{-4}+\frac{1}{8}\)
d, \(\frac{-56}{77}-\frac{30}{66}\)
e,\(\frac{-3}{9}+\frac{5}{-3}\)
a, \(\frac{-5}{21}+\frac{2}{9}=\frac{-15}{63}+\frac{14}{63}=\frac{-1}{63}\)
b, \(\frac{-4}{21}-\frac{5}{12}=\frac{-16}{84}-\frac{35}{84}=\frac{-51}{84}=\frac{-17}{28}\)
c, \(\frac{6}{-4}+\frac{1}{8}=\frac{-3}{2}+\frac{1}{8}=\frac{-12}{8}+\frac{1}{8}=\frac{-11}{8}\)
d, \(\frac{-56}{77}-\frac{30}{66}=\frac{-8}{11}-\frac{5}{11}=\frac{-13}{11}\)
e, \(\frac{-3}{9}+\frac{5}{-3}=\frac{-1}{3}+\frac{-5}{3}=\frac{-6}{3}=-2\)
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bài 1 ;thực hiện phép tính
a, \(\frac{-1}{2}+\frac{1}{3}+\frac{2}{4}\)
b, \(\frac{-5}{21}+\frac{2}{9}\)
c, \(\frac{-4}{21}-\frac{5}{12}\)
d,\(\frac{6}{-4}+\frac{1}{8}\)
e,\(\frac{-56}{77}-\frac{30}{66}\)
f,\(\frac{-3}{9}+\frac{5}{-3}\)
\(\frac{-1}{2}+\frac{1}{3}+\frac{2}{4}=\frac{-6}{12}+\frac{4}{12}+\frac{6}{12}\)
= \(\frac{4}{12}\)
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\(\frac{69}{77}\)X \(\frac{21}{11}\)
\(\frac{69}{77}\): \(\frac{21}{11}\)
\(\frac{69}{77}\)- \(\frac{21}{11}\)
\(\frac{69}{77}\)+ \(\frac{21}{11}\)
\(\frac{69}{77}\times\frac{21}{11}=\frac{69\times21}{77\times11}=\frac{1449}{847}=\frac{207}{121}\)
\(\frac{69}{77}:\frac{21}{11}=\frac{69}{77}\times\frac{11}{21}=\frac{69\times11}{77\times21}=\frac{759}{1617}=\frac{23}{49}\)
\(\frac{66}{77}-\frac{21}{11}=\frac{66}{77}-\frac{147}{77}=\frac{66-147}{77}=\frac{-81}{77}\)
\(\frac{69}{77}+\frac{21}{11}=\frac{69}{77}+\frac{147}{77}=\frac{69+147}{77}=\frac{216}{77}\)
~ Hok tốt ~
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\(\frac{69}{77}.\frac{21}{11}=\frac{207}{121}\)
\(\frac{69}{77}:\frac{21}{11}=\frac{23}{49}\)
\(\frac{69}{77}-\frac{21}{11}=-\frac{78}{77}\)
\(\frac{69}{77}+\frac{21}{11}=\frac{216}{77}\)
***
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Bài làm
\(\frac{69}{77}x\frac{21}{11}=\frac{207}{121}\)
\(\frac{69}{77}:\frac{21}{11}=\frac{69}{77}x\frac{11}{21}=\frac{23}{49}\)
\(\frac{69}{77}-\frac{21}{11}=\frac{69}{77}-\frac{147}{77}=-\frac{78}{77}\)
\(\frac{69}{77}+\frac{21}{11}=\frac{69}{77}+\frac{147}{77}=\frac{216}{77}\)
# Chúc bạn học tốt #
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\(\frac{\left(37\frac{3}{7}-35\frac{2}{5}\right).\left(9^9+36.27^5\right)}{71.3^{17^{ }}.\left(x-0.25\right)}=\frac{1}{21}+\frac{1}{77}+\frac{1}{165}\) . Tìm x
tìm các số nguyên x,v,z,t,u biết:
\(\frac{4}{3}\)+\(\frac{8}{x}-\frac{y}{21}-\frac{40}{Z}-\frac{16}{t}=\frac{u}{111}_{ }\)
Tìm x, biết: \(\frac{x+5}{95}+\frac{x+6}{94}+\frac{x+7}{93}+\frac{x+8}{92}+\frac{x+9}{91}=-5\)
\(\frac{x+5}{95}+\frac{x+6}{94}+\frac{x+7}{93}+\frac{x+8}{92}+\frac{x+9}{91}=-5\)
\(\left(\frac{x+5}{95}+1\right)+\left(\frac{x+6}{94}+1\right)+\left(\frac{x+7}{93}+1\right)+\left(\frac{x+8}{92}+1\right)+\left(\frac{x+9}{91}+1\right)=-5+5=0\)
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\(\frac{3}{2}+\frac{7}{6}+\frac{13}{12}+\frac{21}{20}+...............+\frac{91}{90}+\frac{111}{110}\)
Gọi tổng dãy số hạng trên là A
A = 1 + \(\frac{1}{2}\)+ 1 + \(\frac{1}{6}\)+ 1 + \(\frac{1}{12}\)+ ... + 1 + \(\frac{1}{90}\)+ 1 + \(\frac{1}{110}\)
Mà từ \(\frac{1}{2}\)đén \(\frac{1}{110}\) có 10 số
A = 1 x 10 + \(\frac{1}{2}\)+( \(\frac{1}{2}\)- \(\frac{1}{3}\)) + ( \(\frac{1}{3}\)-\(\frac{1}{4}\)) + (\(\frac{1}{4}\)-\(\frac{1}{5}\)) + ... + \(\frac{1}{11}\)
A = 10 + \(\frac{1}{2}\)+ \(\frac{1}{2}\)+ \(\frac{1}{11}\)= \(\frac{112}{11}\)
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