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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-8,5\cdot16,35-83.65\cdot8,5\)
= \(8,5\cdot\left(-16,35\right)-83,65\cdot8,5\)
\(=8,5\cdot\left(-16,35-83.65\right)\)
\(=8,5\cdot\left(-100\right)\)
`= -850`
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\left(-8,5\right)+16,35+\left(-4,5\right)-\left(-2,25\right)\\ =\left[\left(-8,5\right)+\left(-4,5\right)\right]+\left[16,35-\left(-2,25\right)\right]\\ =-13+18,6=5,6\\ b,5,63+\left(-2,75\right)-\left(-8,94\right)+9,06-15,25\\ =5,63-2,75+8,94+9,06-15,25\)
\(=5,63-\left(2,75+15,25\right)+\left(8,94+9,06\right)\\ =5,63-18+18\\ =5,63\)
a) (-8,5) + 16,35 + (-4,5) - (-2,25) = 5,6
b) 5,63 + (-2,75) - (-8,94) + 9,06 - 15,25 = 5,63
![](https://rs.olm.vn/images/avt/0.png?1311)
\(125+\left\{7,5-\left[8,5:2,5+0,8\right].0,6\right\}-3.6:\left(4-1,5\right)\)
\(=125+\left\{7,5-\left[3,4+0,8\right].0,6\right\}-3,6:2,5\)
\(=125+\left\{7,5-\left[4,2\right].0,6\right\}-1,44\)
\(=125+\left\{3,3.0,6\right\}-1,44\)
\(=125+1,98-1,44\)
\(=126,98-1,44\)
\(=125,54\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.\)\(\frac{2}{7}+x=1,25\)
\(\Leftrightarrow x=1,25-\frac{2}{7}\)
\(\Leftrightarrow x=\frac{5}{4}-\frac{2}{7}\)
\(\Leftrightarrow x=\frac{35}{28}-\frac{8}{28}\)
\(\Leftrightarrow x=\frac{27}{28}\)
\(b.\)\(x:8,5=2,2\)
\(\Leftrightarrow x=2,2.8,5\)
\(\Leftrightarrow x=18,7\)
\(c.\)\(-4\frac{1}{5}-x=2,25\)
\(\Leftrightarrow-\frac{21}{5}-x=\frac{9}{4}\)
\(\Leftrightarrow x=-\frac{21}{5}-\frac{9}{4}\)
\(\Leftrightarrow x=-\frac{84}{20}-\frac{45}{20}\)
\(\Leftrightarrow x=-\frac{129}{45}\)
\(d.\)\(x=11\frac{1}{4}-\left(2\frac{5}{7}+5\frac{1}{4}\right)\)
\(\Leftrightarrow x=\frac{45}{4}-\left(\frac{19}{7}+\frac{21}{4}\right)\)
\(\Leftrightarrow x=\frac{45}{4}-\frac{19}{7}-\frac{21}{4}\)
\(\Leftrightarrow x=\left(\frac{45}{4}-\frac{21}{4}\right)-\frac{19}{7}\)
\(\Leftrightarrow x=6-\frac{19}{7}\)
\(\Leftrightarrow x=\frac{42}{7}-\frac{19}{7}\)
\(\Leftrightarrow x=\frac{23}{7}\)
a) x = \(\frac{5}{4}-\frac{2}{7}\)
x = \(\frac{35}{28}-\frac{8}{28}\)
x = \(\frac{27}{28}\)
b) x = 2,2 x 8,5 = 18,7
c) -0,8 - x = 2,25
x = -3,05
d) x = dư nhiều bn ơi
Hội con 🐄 chúc bạn học tốt!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:4/x=x/4
Hay x2/4x=16/4x
Hay x2=16
Hay x2=42
Hay x=4
Suy ra x=4
Vậy x=4
\(-8.5\left(16.35+83.65\right)=-8.5\times100=-850\)
`(-8,5) . 16,35 - 8,5 . 83,65`
`= 8,5 . (-16,35 - 83,65)`
`= 8,5 . (-100)`
`= -850`
Lưu ý: Sắp hết học kì mà bận vẫn dùng dấu `xx` này là dở rồi nhé