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70 - 5(x - 3) = 45
5(x - 3) = 45 - 70
5(x - 3) = -25
x - 3 = (-25) : (-5)
x - 3 = 5
x = 5 + 3
x = 8
Trả lời
1)70-5.(x-3)=45
5.(x-3)=70-45
5.(x-3)=25
x-3 =25:5
x-3 =5
x =5+3
x =8.
2)123-5(x+4)=38
5(x+4)=123-38
5(x+4)=85
x+4 =85:5
x+4 =17
x =17-4
x =13.
3)(3x-24).73=2.74
3x-24 =2.74:73
3x-16 =2.7=14(bước này mk rút gọn nhé)
3x =14+16
3x =30
x =30:3
x =10.
Để mk làm tiếp câu cuối nhé !
![](https://rs.olm.vn/images/avt/0.png?1311)
a, (x + 2) + (x + 4) + (x + 6) + ... + (x + 50) = 750
=> x + 2 + x + 4 + x + 6 + ... + x + 50 = 750
=> (x + x + x + ... + x) + (2 + 4 + 6 + ... + 50) = 750
=> 25x + (50 + 2).25 : 2 = 750
=> 25x + 52.25 : 2 = 750
=> 25x + 650 = 750
=> 25x = 100
=> x = 4
a) ( x+x+...+x)+(2+4+6+...+50)= 750
( x*25)+ (50+2)*25:2 = 750
(x*25)+ 650 = 750
x* 25 = 750 - 650 = 100
x = 100 :25 = 4
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\dfrac{7}{12}-\left(x+\dfrac{7}{10}\right):\dfrac{6}{5}=\dfrac{5}{4}\)
\(\Leftrightarrow\dfrac{7}{12}-x-\dfrac{7}{10}:\dfrac{6}{5}=\dfrac{5}{4}\)
\(\Leftrightarrow\dfrac{7}{12}-x-\dfrac{7}{12}=\dfrac{5}{4}\)
\(\Leftrightarrow\dfrac{7}{12}-x=\dfrac{5}{4}+\dfrac{7}{12}\)
\(\Leftrightarrow\dfrac{7}{12}-x=\dfrac{11}{6}\)
\(\Leftrightarrow x=\dfrac{7}{12}-\dfrac{11}{6}\)
\(\Leftrightarrow\dfrac{-5}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1, -2/3+(5/2-x)=1-|-1/6|
-4/6+15/6-x=1-1/6
11/6-x=5/6
x=11/6-5/6
x=6/6=1
2,-2/5+1/6+1/5<x<-3/4+9/7+(-1/4)+5/7
-12/30+5/30+6/30<x<-21/28+36/28-7/28+20/28
-1/30<x<1
=>x thuộc TH Q, và -1/30<x<1 (các số hữu tỉ)
chúc bạn học tốt nha
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-\frac{1}{10}< =x< =\frac{3}{5}\)
\(\frac{-4}{9}< x< =\frac{2}{3}\)
\(\frac{6}{7}+\frac{5}{7.\left(-5\right)}=\frac{-1}{28.\left(-2\right)^2}\)
\(< =>\frac{6\left(-35\right)}{7\left(-35\right)}+\frac{35}{7\left(-35\right)}=-\frac{1}{28.4}=-\frac{1}{112}\)
\(< =>\frac{5\left(-35\right)}{7\left(-35\right)}=-\frac{1}{112}\)
\(< =>\frac{1}{112}=\frac{1}{2.\left(-35\right)}\)
\(< =>-35.2=112\)(vô lý)