29 x 9 = ?
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{9}{10}\times\left(\dfrac{11}{29}+\dfrac{2}{29}+\dfrac{16}{29}\right)=\dfrac{9}{10}\times\dfrac{29}{29}=\dfrac{9}{10}\times1=\dfrac{9}{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{5\cdot4^{15}\cdot9^9-4\cdot3^{20}\cdot8^9}{5\cdot2^{29}\cdot9^{10}-7\cdot2^{29}\cdot27^6}\)
\(=\dfrac{5\cdot2^{30}\cdot3^{18}-2^2\cdot2^{27}\cdot3^{20}}{5\cdot2^{29}\cdot3^{20}-7\cdot2^{29}\cdot3^{18}}\)
\(=\dfrac{2^{29}\cdot3^{18}\left(5\cdot2-3^2\right)}{2^{29}\cdot3^{18}\left(5\cdot3^2-7\right)}\)
\(=\dfrac{10-9}{5\cdot9-7}=\dfrac{1}{38}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,0,5x-\frac{2}{3}x=\frac{7}{12}\Rightarrow\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow x\left(\frac{1}{2}-\frac{2}{3}\right)=\frac{7}{12}\Rightarrow x\cdot\left(\frac{3}{6}-\frac{4}{6}\right)=\frac{7}{12}\)
\(\Rightarrow x\cdot\left(-1\right)=\frac{7}{12}\Rightarrow x=\frac{7}{12}:\left(-1\right)=\frac{7}{-12}\)
\(c,\frac{\left(x-5\right)}{12}\cdot\frac{9}{29}=\frac{-6}{29}\Rightarrow\frac{\left(x-5\right)}{12}=\frac{-6}{29}:\frac{9}{26}\)
\(\frac{\Rightarrow\left(x-5\right)}{12}=\frac{-6}{9}=\frac{-2}{3}\Rightarrow x-5=-\frac{2}{3}\cdot12\)
\(\Rightarrow x-5=\frac{-24}{3}=-8\Rightarrow x=-8+5=-3\)
\(a,0,5x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow-\frac{1}{6}x=\frac{7}{12}\)
\(\Rightarrow x=-\frac{7}{2}\)
\(c,\frac{x-5}{12}\cdot\frac{9}{29}=-\frac{6}{29}\)
\(\Rightarrow\frac{x-5}{12}=-\frac{2}{3}\)
\(\Rightarrow x-5=12.\left(-\frac{2}{3}\right)\)
\(\Rightarrow x-5=-8\)
\(\Rightarrow x=-3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
9. Tìm x biết
a x- ( 12- 15)= -8
<=> x - 12 + 15 = -8
<=> x + 3 = -8
<=> x = -11
Vậy x = -11
b. (x- 29 )- ( 17- 38)= -9
<=> x - 29 - 17 + 38 = -9
<=> x - 8 = -9
<=> x = -1
Vậy x = -1
a) x-12+15=-8
=>x=-8-15+12
=>x=-11
Vậy x=-11
b)x-29+21=-9
=>x=-9-21+29
=>x=-1
Vậy x=-1
![](https://rs.olm.vn/images/avt/0.png?1311)
59 + 64 = 36 + 63 + 59 _Sai_
129 + 157 - 29 =129 - 29 + 157 _Đúng_
129 + 157 - 29 = 157 + 129 - 29 _Đúng_
4 +16 x 25 = 16 + 4 x 25 _Sai_
21 + 49 : 7 = 49 + 21 : 7 _Sai_
(36 + 45 ) : 9 = (45+36 ) : 9 _Đúng_
(Cái này tính nhẩm là ra thôi bạn ạ! Đúng cho mình 1 tick nhé bạn!)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) -18-(x-6)=0
x-6=(-18)-0
x-6=-18
x = (-18)+6
x = -12
b) 29-(10+29)=x-(27-9)
29-39 = x-18
-10 =x-18
x-18=-10
x = (-10)+18
x = 8
Học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
PT \(\Leftrightarrow x-29-17+38=-9\)
\(\Leftrightarrow x=-9-38+17+29=-1\)
Vậy ...
![](https://rs.olm.vn/images/avt/0.png?1311)
3x – 47.2 + x = - 29 + (-9)
3x – 47.2 + x = -38
3x – 94 + x = -38
3x – 94 = -38 - x
3x + x = -38 + 94
4x = 56
x = 56 : 4
x = 14
Vậy x = 14
=261
các bn cho mk vài li-ke cho tròn 860 với
29 x 9 = 261
Tick nha! Phạm Lê Đức Việt