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vì x ; x = 2/18
mà x phải bằng nhau nên x bằng
2/18 ; 2 =1/18
\(\times\cdot\times=\frac{1}{9}\)
\(\times\cdot\times=\frac{1}{3}\cdot\frac{1}{3}\)
\(\times=\frac{1}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(x\cdot\frac{1}{2}+x\cdot\frac{1}{4}+x\cdot\frac{1}{8}=\frac{21}{24}\)
\(x\cdot\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}\right)=\frac{7}{8}\)
\(x\cdot\frac{7}{8}=\frac{7}{8}\)
\(\Rightarrow x=\frac{7}{8}\div\frac{7}{8}=1\)
b) \(\left(x+4\right)+\left(x+9\right)+\left(x+14\right)+.....+\left(x+44\right)+\left(x+49\right)=1430\)
\(\left(x+x+x+....+x+x\right)+\left(4+9+14+...+44+49\right)=1430\)
\(10x+265=1430\)
\(10x=1430-265\)
\(10x=1165\)
\(\Rightarrow x=\frac{1165}{10}=116,5\)
c) \(x\cdot0,25-0,5=1\)
\(x\cdot0,25=1+0,5\)
\(x\cdot0,25=1,5\)
\(\Rightarrow x=1,5\div0,25=6\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x.\left(\frac{1}{6}.\frac{72}{10}+\frac{13}{10}+\frac{1}{2}\right)+15=19.75\)
\(\Leftrightarrow x.\left(\frac{6}{5}+\frac{13}{10}+\frac{1}{2}\right)=4,75\)
\(\Leftrightarrow x.3=4,75\) \(\Rightarrow x=1,583\)
Ủa mà có bài thì tự đi mà làm bài này có khó lắm đâu
![](https://rs.olm.vn/images/avt/0.png?1311)
a,
x.2/7.3/4=5/21
x.3/14=5/21
x=5/21:3/14
x=10/9
b,
x.1/2=1/3
x=1/3:1/2
x=2/3
c,
x:4/5=25/8:5/4
x:4/5=5/2
x=5/2.4/5=2
A, x= 5/25 : 3/4 : 2/7 = 14/15
B, x=1/3 : 1/2 = 2/3
C, x=(25/8 : 5/4)x4/5 = 5/2 x 4/5 = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x\cdot\frac{1}{3}+x\cdot\frac{2}{5}-4=3\)
\(x\cdot\left(\frac{1}{3}+\frac{2}{5}\right)-4=3\)
\(x\cdot\frac{11}{15}=7\)
\(x=\frac{105}{11}\)
\(x.\frac{1}{3}+x.\frac{2}{5}-4=3\)
\(\Rightarrow x.\left(\frac{1}{3}+\frac{2}{5}\right)=7\)
\(\Rightarrow x.\left(\frac{5}{15}+\frac{6}{15}\right)=7\)
\(\Rightarrow x.\frac{11}{15}=7\Rightarrow x=7:\frac{11}{15}=\frac{105}{11}\)
Vậy x = 105/11
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) \(x+x\times\frac{1}{3}\div\frac{2}{9}+x\div\frac{2}{7}=252\)
\(x\times1+x\times\frac{1}{3}\div\frac{2}{9}+x\div\frac{2}{7}=252\)
\(x\times1+x\times\frac{1}{3}\times\frac{9}{2}+x\times\frac{7}{2}=252\)
\(x\times1+x\times\frac{9}{6}+x\times\frac{7}{2}=252\)
\(x\times\left(1+\frac{9}{6}+\frac{7}{2}\right)=252\)
\(x\times6=252\)
\(x=252\div6\)
\(x=42\)
b ) \(\left(3\times x-0,8\right)\div x+14,5=15\)
\(\left(3\times x-0,8\right)\div x=15-14,5\)
\(\left(3\times x-0,8\right)\div x=0,5\)
\(0,8\div x=3-0,5\)
\(0,8\div x=2,5\)
\(x=0,8\div2,5\)
\(x=0,32\)
![](https://rs.olm.vn/images/avt/0.png?1311)
= \(\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot\cdot\cdot\frac{19}{20}=\frac{1}{20}\)
=\(\frac{1}{2}.\frac{2}{3}.\frac{3}{4}......\frac{19}{20}\)
= đến đây bn xem trong thống kê hỏi đáp nhé
= :))
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\Leftrightarrow x+1,5x+3,5x=252\)
<=>6x=252
<=>x=42
ủng hộ nhe
\(xx=\frac{2}{18}=\frac{1}{9}\)
<=> \(x^2=\left(\frac{1}{3}\right)^2\)
<=> \(x=\pm\frac{1}{3}\)
\(x.x=\frac{2}{18}\)
\(x^2=\frac{1}{9}\)
đến đây tịt rùi hc tốt !!!