help me cíu!!=((
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\(\dfrac{8\times3\times4}{16\times3}\)
\(=\dfrac{8\times3\times2\times2}{8\times2\times3}\)
b) \(\dfrac{30\times25\times7\times8}{75\times8\times12\times14}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{5}{3};\dfrac{29}{14}\)
b) \(\dfrac{9}{21};\dfrac{45}{105}\)
a) \(\dfrac{5}{3}\);\(\dfrac{99}{100}\);\(\dfrac{29}{14}\)
b) \(\dfrac{9}{21}\);\(\dfrac{33}{77}\);\(\dfrac{45}{105}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(\Leftrightarrow\left(5x+\dfrac{3}{2}\right):\dfrac{8}{15}=\dfrac{25}{12}-\dfrac{5}{6}=\dfrac{25}{12}-\dfrac{10}{12}=\dfrac{15}{12}=\dfrac{5}{4}\)
\(\Leftrightarrow5x+\dfrac{3}{2}=\dfrac{5}{4}\cdot\dfrac{8}{15}=\dfrac{40}{60}=\dfrac{2}{3}\)
\(\Leftrightarrow5x=\dfrac{2}{3}-\dfrac{3}{2}=\dfrac{4-9}{6}=\dfrac{-5}{6}\)
hay x=-1/6
b: \(\Leftrightarrow\dfrac{1}{4}\left(2-\dfrac{1}{2}x\right)=\dfrac{5}{2}-\dfrac{1}{4}=\dfrac{10}{4}-\dfrac{1}{4}=\dfrac{9}{4}\)
=>2-1/2x=9
=>1/2x=-7
hay x=-14
c: \(\Leftrightarrow\left(x-7\right)^2=144\)
=>x-7=12 hoặc x-7=-12
=>x=19 hoặc x=-5
d: \(\Leftrightarrow4x+2=3x-15\)
hay x=-17
e: =>1/6x=-4
hay x=-24
![](https://rs.olm.vn/images/avt/0.png?1311)
Hôm nay là thứ 7, và mỗi tuần có 7 ngày. Vậy để biết thứ mấy sau 350 ngày, ta chia 350 cho 7 và lấy phần dư. 350 ÷ 7 = 50, dư 0 Vì vậy, sau 350 ngày sẽ vẫn là thứ 7.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lượng cỏ trong cỏ tươi là:
100% - 55 % = 45 %
Lượng cỏ có trong cỏ khô là:
100% - 10% = 90%
100 kg cỏ tươi có:
100. 45%= 45 kg cỏ
Phơi 100kg cỏ tươi có:
45:90%=50 (kg)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1 was repaired
2 Was - bought
3 are watered
4 wasn't learned
5 was watched
6 Is - read
7 was stolen
8 was broken
9 wasn't cut
10 is cleaned
![](https://rs.olm.vn/images/avt/0.png?1311)
a: Xét ΔMEN có ME<MN+NE
b: ME<MN+NE
=>ME+EP<MN+NE+EP=MN+NP
where câu c :)))))))))
ko bt làm à =>>>>
c) là ko bt làm :))))))
`(x-2)^2/12-(x+1)^2/21=[(x-4)(x-6)]/28`
`<=> [7(x^2-4x+4)]/84-[4(x^2+2x+1)]/84=[3(x^2-6x-4x+24)]/84`
`=>7x^2 -28x+28 - 4x^2 -8x-4 = 3x^2- 18x -12x +72`
`<=> 7x^2 -28x -4x^2 -8x +18x +12x -3x^2 =72-28+4`
`<=>-6x = 48
`<=> x = -8`
Vậy `S={-8}`
\(\dfrac{\left(X-2\right)^2}{12}\)- \(\dfrac{\left(X+1\right)^2}{21}\)=\(\dfrac{\left(X-4\right)\left(X+6\right)}{28}\)
<=> \(\dfrac{7\left(X-2\right)^2}{84}\)-\(\dfrac{4\left(X+1\right)^2}{84}\)=\(\dfrac{3\left(X-4\right)\left(X-6\right)}{84}\)
<=>7(x-2)2 - 4(x+1)2 = 3(x-4)(x-6)
<=>7(x2 - 4x + 4) - 4(x2 + 2x + 1) = 3(x2 - 10x + 24)
<=>7x2 - 28x + 28 - 4x2 - 8x - 4 = 3x2 -30x +72
<=>7x2 - 4x2 - 3x2 - 28x - 8x + 30x = - 28 + 4 + 72
<=> 50x = 48
<=> x = \(\dfrac{48}{50}\)
<=> x = \(\dfrac{24}{25}\)
S = \(\left\{\dfrac{24}{25}\right\}\)