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b){x-[52+(35-80.3)3-51]50+14}=20
=>x-[25+(243-240)3-51]50+14=20
=>x-[25+33-51]50+14=20
=>x-[25+27-51]50+14=20
=>x-[52-51]50+14=20
=>x-150+14=20
=>x-1+14=20
=>x-1=20-14
=>x-1=6
=>x=6+1
=>x=7
![](https://rs.olm.vn/images/avt/0.png?1311)
a){x-[52+(35-80.3)3-51]50+14}=20
=>x-[25+(243-240)3-51]50+14=20
=>x-[25+33-51]50+14=20
=>x-[25+27-51]50+14=20
=>x-[52-51]50+14=20
=>x-150+14=20
=>x-1+14=20
=>x-1=20-14
=>x-1=6
=>x=6+1
=>x=7
![](https://rs.olm.vn/images/avt/0.png?1311)
24 hay là 2( số nhân với mẫu rồi cộng tử) rùi đến 4 phần 5
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(2\frac{4}{5}.x-50\right):\frac{2}{3}=51\)
\(\Leftrightarrow\)\(\frac{14}{5}.x-50=51.\frac{2}{3}=34\)
\(\Leftrightarrow\)\(\frac{14}{5}x=34+50=84\)
\(\Leftrightarrow\)\(x=84:\frac{14}{5}=30\)
Vậy....
\(\left(2\frac{4}{5}x-50\right):\frac{2}{3}=51\)
\(\left(\frac{14}{5}x-50\right)=51\times\frac{2}{3}\)
\(\left(\frac{14}{5}x-50\right)=34\)
\(\frac{14}{5}x=34+50\)
\(\frac{14}{5}x=84\)
\(x=84:\frac{14}{5}\)
\(x=30\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2\frac{4}{5}.x-50:\frac{2}{3}=51\)
\(\frac{14}{5}.x-50:\frac{2}{3}=51\)
\(\frac{14}{51}.x=51+50:\frac{2}{3}\)
\(\frac{14}{51}.x=51+75\)
\(\frac{14}{51}.x=126\)
\(x=126:\frac{14}{51}\)
x=459
Vậy x=459
\(\frac{2}{3}.x=\frac{5}{12}=>x=\frac{5}{12}:\frac{2}{3}=\frac{5.3}{12.2}=\frac{15}{24}\)=\(\frac{3}{8}\)
vậy x=3/8
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5 + 32 . |x | = 50
32 . | x | = 50 - 5
32 . | x | = 45
9 . x = 45 => x = 45 : 9 => x = 5
9 . x = - 45 => x = - 45 : 9 => x = - 5
92 - | x + 1 | = | - 51 |
81 - | x + 1 | = 51
x + 1 = 81 - 51
x + 1 = 30 => x = 29
x + 1 = - 30 => x = - 29
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài toán sai
bài toán đúng là x+(x+1)+(x+2)+(x+3)+...+19+20=20
\(\left(\frac{24}{5}+x+50\right):\frac{2}{3}\)\(=-51\)
\(\left(\frac{24}{5}+x+50\right)\)\(=-51.\frac{2}{3}\)
\(\left(\frac{24}{5}+x+50\right)\)\(=-34\)
\(\frac{24}{5}\)\(+x\)\(=-34-50\)
\(\frac{24}{5}\)\(+x\)\(=-84\)
\(x=-84-\frac{24}{5}\)
\(x=-88,8\)
dễ thế mk còn hỏi