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Đặt A=2,0+2,1+2,2+...+7,9+8,0
A có: (8-2)/0,1+1=61(số hạng)
A =(8+2)*61/2=305(1)
Đặt B =\(\frac{26\cdot49-23}{25\cdot49+26}\)
\(=\frac{\left(25+1\right)49-23}{25\cdot49+26}=\frac{1225+49-23}{1225+26}=\frac{1225+\left(49-23\right)}{1225+26}=\frac{1225+26}{1225+26}=1\)(2)
Từ 1,2 => A/B
\(=\left(2,0+2,1+2,2+...+7,9+8,0\right):\left(\frac{26\cdot49-23}{25\cdot49+26}\right)\)
\(=\frac{305}{1}=305\)
Chúc bạn học tốt!^_^
\(26.49-\frac{23}{25}.49+26\)
=\(1274-\frac{1127}{25}+26\)
=\(\frac{30723}{25}+26\)
=\(\frac{31373}{25}\)
k mk nha bn
2,7 x 7,5 + 7,7 = 20,25 + 7,7
= 27,95
45,1 - 22,2 + 8,9 x 7,8 = 45,1 - 22,2 + 69,42
= 92,32
( 8,73 - 4,44 ) x 2,25 = 4,29 x 2,25
= 9,6525
\(7\)x \(\frac{2}{3}-\frac{2}{5}:\frac{1}{2}-\frac{2}{3}\)= \(\frac{14}{3}-\frac{4}{5}-\frac{2}{3}\)
= \(\frac{16}{5}\)
( 8 x \(\frac{2}{3}:\frac{1}{2}\)) x \(\frac{5}{8}\)= \(\frac{32}{3}\)x \(\frac{5}{8}\)
= \(\frac{20}{3}\)
2.7 * 7.5 + 7.7 = 20.25 + 7.7 = 27.95
45.1 - 22.2 + 8.9 * 7.8 = 45.1 - 22.2 + 69.42 = 22.9 + 69.42 = 92.32
7 * \(\frac{2}{3}-\frac{2}{5}\)/ \(\frac{1}{2}-\frac{2}{3}\)= \(\frac{2}{3}\cdot\left(7-1\right)-\frac{2}{5}\cdot\frac{2}{1}\)= \(\frac{2}{3}\cdot6-\frac{4}{5}\)= 4-\(\frac{4}{5}\)= \(\frac{20}{5}-\frac{4}{5}\)= \(\frac{16}{5}\)
(8 * \(\frac{2}{3}\)/ \(\frac{1}{2}\)) * \(\frac{5}{8}\)= \(\left(\frac{16}{3}\cdot\frac{2}{1}\right)\cdot\frac{5}{8}\)= \(\frac{32}{3}\cdot\frac{5}{8}\)= \(\frac{20}{3}\)
\(x-1\frac{1}{2}=1\frac{1}{3}\)
\(x=1\frac{1}{3}+1\frac{1}{2}\)
\(x=\frac{17}{6}\)
\(x-2,1=2,2\)
\(x=2,2+2,1\)
\(x=4,3\)
\(a,\frac{26}{60}+\frac{3}{15}=\frac{13}{30}+\frac{1}{5}=\frac{13}{30}+\frac{6}{30}=\frac{19}{30}\)
\(b,\frac{4}{26}+\frac{33}{78}=\frac{2}{13}+\frac{11}{26}=\frac{4}{26}+\frac{11}{26}=\frac{15}{26}\)
\(c,\frac{25}{40}-\frac{3}{12}=\frac{5}{8}-\frac{1}{4}=\frac{5}{8}-\frac{2}{8}=\frac{3}{8}\)
\(d,\frac{21}{27}+\frac{10}{54}+\frac{5}{15}=\frac{7}{9}+\frac{5}{27}+\frac{1}{3}=\frac{21}{27}+\frac{5}{27}+\frac{9}{27}=\frac{35}{27}\)
~Study well~
#Thạc_Trân
Ta có : \(\frac{3}{4}< 1\)
\(\frac{9}{14}< 1\)
\(\frac{19}{17}>1\)
\(\frac{23}{23}=1\)
Vậy phân số lớn hơn 1 là \(\frac{19}{17}\)
Ta co: 3/4 < 1
9/14 < 1
19/17 > 1
23/23 = 1
*Nen suy ra phan so 19/17 lon hon 1.
Đặt A=2,0+2,1+2,2+...+7,9+8,0
A có: (8-2)/0,1+1=61(số hạng)
A =(8+2)*61/2=305(1)
Đặt B =26·49−2325·49+26
=(25+1)49−23/25*49+26 =1225+49−23/1225+26 =1225+(49−23)/1225+26 =1225+26/1225+26 =1
Từ 1,2 => A/B
=(2,0+2,1+2,2+...+7,9+8,0):(26·49−2325·49+26 )
=305/1 =305
Đặt A=2,0+2,1+2,2+...+7,9+8,0
A có: (8-2)/0,1+1=61(số hạng)
A =(8+2)*61/2=305(1)
Đặt B =26·49−2325·49+26
=(25+1)49−23/25·49+26 =1225+49−23/1225+26 =1225+(49−23)/1225+26 =1225+26/1225+26 =1
Từ 1,2 => A/B
=(2,0+2,1+2,2+...+7,9+8,0):(26·49−2325·49+26 )
=305/1 =305