13/28.x=(555/222+4444/12221+33333/244442+11/330+3/60)
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(B=\frac{1}{7}\left(\frac{5}{2}+\frac{4}{11}+\frac{3}{22}+\frac{11}{30}+\frac{13}{60}\right)\)
\(B=\frac{1}{7}\left(\frac{5}{2}+\frac{11}{22}+\frac{35}{60}\right)\)
quy đồng tính nốt ra \(B=\frac{43}{84}\)
Nhớ bấm L I K E cho mk nhá :))))
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
B=1/7.(555/222+4444/1221+33333/244442+11/330+13/60
B= 1/7.(5/2+4/11+3/22+11/330+13/60)
B= 1/7.(1650/660+240/660+90/660+22/660+143/660)
B=1/7.143/44
B=143/308
k mk nha, k xong bình luận bên dưới mk k lại cho
![](https://rs.olm.vn/images/avt/0.png?1311)
Xin lỗi, mình chỉ làm được câu 1 thôi
\(A=\frac{1}{7}\left(\frac{555}{222}+\frac{4444}{12221}+\frac{33333}{244442}+\frac{11}{330}+\frac{13}{60}\right)\)
\(A=\frac{1}{7}\left(\frac{5.111}{2.111}+\frac{4.1111}{11.1111}+\frac{3.11111}{22.11111}+\frac{11}{11.30}+\frac{13}{60}\right)\)
\(A=\frac{1}{7}\left(\frac{5}{2}+\frac{4}{11}+\frac{3}{22}+\frac{1}{30}+\frac{13}{60}\right)\)
\(A=\frac{1}{7}\left[\left(\frac{5}{2 }+\frac{1}{30}+\frac{13}{60}\right)+\left(\frac{4}{11}+\frac{3}{22}\right)\right]\)
\(A=\frac{1}{7}\left[\left(\frac{150}{60}+\frac{2}{60}+\frac{13}{60}\right)+\left(\frac{8}{22}+\frac{3}{22}\right)\right]\)
\(A=\frac{1}{7}\left(\frac{11}{4}+\frac{1}{2}\right)\)
\(A=\frac{1}{7}.\frac{13}{4}\)
\(A=\frac{13}{21}\)