tính 1 cách hợp lý cảm ơn ạ :3
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{3}{5}.\left(\frac{5}{3}-\frac{2}{7}\right)-\left(\frac{7}{3}-\frac{3}{7}\right).\frac{3}{5}\)
\(=\frac{3}{5}.\text{[}\left(\frac{5}{3}-\frac{2}{7}\right)-\left(\frac{7}{3}-\frac{3}{7}\right)\text{]}\)
\(=\frac{3}{5}.\text{[}\frac{5}{3}-\frac{2}{7}-\frac{7}{3}+\frac{3}{7}\text{]}\)
\(=\frac{3}{5}.\text{[}\left(\frac{5}{3}-\frac{7}{3}\right)-\left(\frac{2}{7}-\frac{3}{7}\right)\text{]}\)
\(=\frac{3}{5}.\text{[}\frac{-2}{3}-\frac{-1}{7}\text{]}\)
\(=\frac{3}{5}.\left(\frac{-2}{3}+\frac{1}{7}\right)\)
\(=\frac{3}{5}.\left(\frac{-14}{21}+\frac{3}{21}\right)\)
\(=\frac{3}{5}.\frac{-11}{21}\)
\(=\frac{3.\left(-11\right)}{5.21}\)
\(=\frac{-11}{5.7}=\frac{-11}{35}\)
Chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
(2/3.5/7 + 2/3: 7/2). -1/3
=(10/21 + 2/3x2/7 ) . -1/3
=(10/21 + 4/21) . -1/3
=-10/63 - 4/63
=-14/63
(2/3.5/7+2/3:7/2)-1/3
=(2/3.5/7+2/3x2/7)-1/3
=[2/3.(5/7+2/7)]-1/3
=[2/3x1]-1/3
=2/3-1/3
=1/3
HT
![](https://rs.olm.vn/images/avt/0.png?1311)
=[\(\left(\frac{2}{3}.\frac{5}{7}+\frac{2}{3}.\frac{2}{7}\right).\left(\frac{-1}{3}\right)\)]
=[\(\left(\frac{2}{3}\right).\left(\frac{5}{7}+\frac{2}{7}\right).\left(\frac{-1}{3}\right)\)]
=[\(\left(\frac{2}{3}.1\right).\frac{-1}{3}\)]
=\(\frac{-1}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
A=(-3/4+2/3).11/9+(-1/4+1/3):|-9/11|
\(=\left(-\frac{3}{4}+\frac{2}{3}\right).\frac{11}{9}+\left(-\frac{1}{4}+\frac{1}{3}\right).\frac{11}{9}\)
\(=\frac{11}{9}\left(-\frac{3}{4}+\frac{2}{3}-\frac{1}{4}+\frac{1}{3}\right)\)
\(=\frac{11}{9}\left(-1+1\right)\)
\(=\frac{11}{9}.0\)
=0
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-23\cdot63+23\cdot21-58\cdot23\)
\(=23\left(-63+21-58\right)\)
\(=23\cdot\left(-100\right)\)
\(=-2300\)
![](https://rs.olm.vn/images/avt/0.png?1311)
3.75 : \(\dfrac{1}{4}\) + 3.75 : 0.5 + 3,75 + \(\dfrac{1}{8}\) + 3,75 x 86
= 3,75 : \(\left(\dfrac{1}{4}+0.5+\dfrac{1}{8}\right)\) + 3,75 x 86
= 3,75 : \(\dfrac{7}{8}\) + 322.5
= 4,3 + 322.5 = 326,8
tích hộ chị nha
![](https://rs.olm.vn/images/avt/0.png?1311)
156 x 2 + 156 x 5 + 156 + 156 x 2
= 156 x 2 + 156 x 5 + 156 x 1 + 156 x2
=156 x [ 2 + 5 + 1 + 2 ]
=156 x 10
= 1560
\(=\dfrac{2}{9}-\dfrac{5}{12}+\dfrac{3}{4}\)
\(=\dfrac{8}{36}-\dfrac{15}{36}+\dfrac{27}{36}=\dfrac{20}{36}=\dfrac{5}{9}\)