\(63\frac{59}{1058}\cdot63\frac{108}{2200}\cdot63\frac{103}{2015}+123=?\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1-\frac{2}{3.5}-\frac{2}{5.7}-\frac{2}{7.9}-.......-\frac{2}{61.63}-\frac{2}{63.65}\)
=\(-1.\left(\frac{2}{3.5}+\frac{2}{5.7}+......\frac{2}{63.65}\right)+1\)
=\(-1.\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+.......+\frac{1}{63}-\frac{1}{65}\right)+1\)
=\(-1.\left(\frac{1}{3}-\frac{1}{65}\right)+1\)
=\(-1.\frac{62}{195}+1\)
=\(\frac{-62}{195}+\frac{195}{195}\)
=\(\frac{133}{195}\)
Hok tốt nhé bn
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\)\(\frac{-3}{5}\)\(+\frac{28.43}{5.28.2}\)\(+\frac{4.7.5}{5.4.6}\)\(+\frac{28.21}{5.21.3}\)
\(=\)\(\frac{-3}{5}\)\(+\frac{43}{10}+\frac{7}{6}+\frac{28}{15}\)
\(=\)\(\frac{-48}{90}+\frac{387}{90}+\frac{85}{90}+\frac{168}{90}\)
\(=\)\(\frac{592}{90}\)
\(=\)\(\frac{296}{45}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{253\cdot75-161\cdot37+253\cdot25-161\cdot63}{100\cdot47-12\cdot3,5-5,8:0,1}=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Mình nghĩ đề thế này mới tính hợp lí được
2 ) B = \(1\frac{6}{41}.\left(\frac{12+\frac{12}{19}-\frac{12}{37}-\frac{12}{53}}{3+\frac{3}{19}-\frac{3}{37}-\frac{3}{53}}:\frac{4+\frac{4}{17}+\frac{4}{19}+\frac{4}{2006}}{5+\frac{5}{17}+\frac{5}{19}+\frac{5}{2006}}\right).\frac{124242423}{237373735}\)
B = 47/41 . ( 12/3 : 4/5 ) . 123/235
B = 47/41 . ( 4 : 4/5 ) . 123/235
B = 47/41 . 5 . 123/235
B = \(\frac{47.5.123}{41.235}\)
B = 3
1 ) A = \(\frac{636363.37-373737.63}{1+2+3+...+2006}\)
A = \(\frac{63.10101.37-37.10101.63}{1+2+3+...+2006}\)
A = \(\frac{0}{1+2+3+...+2006}\)
A = 0
![](https://rs.olm.vn/images/avt/0.png?1311)
trừ 1 vào mỗi phân thức ở hai vế
\(\left(x-2016\right)\left(\frac{1}{1953}+\frac{1}{1955}+\frac{1}{1957}+\frac{1}{1959}-\frac{1}{63}-\frac{1}{61}-\frac{1}{59}-\frac{1}{57}\right)=0\)
vì 1/1953 + 1/1955 + 1/1957 + 1/1959 -1/63 -1/61-1/59-1/57 khác0
=> x-2016=0 => x=2016
bạn có thể làm rỏ hơn được không.mình cảm ơn bạn nhiều
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{-63}{108}\)= \(\frac{-7}{12}\)
\(\frac{-33}{-77}\)= \(\frac{3}{7}\)
\(\frac{-5}{10}\)=\(\frac{-1}{2}\)
\(\frac{14}{63}\)=\(\frac{2}{9}\)
\(\frac{-15}{25}\)=\(\frac{-3}{5}\)
\(\frac{-45}{18}\)=\(\frac{-5}{2}\)
\(\frac{12}{15}\)=\(\frac{4}{5}\)
\(\frac{20}{25}\)=\(\frac{4}{5}\)
\(\frac{31}{12}\):Là phân số tối giản
t.i.c.k nha
@@