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a)3,2.x+(-1,2).x+2,7 = -4,9
[3,2+(-1,2)].x+2,7=-4,9
2.x+2,7=-4,9
2x=-4,9-2,7
2x=-7,6
x=-7,6:2
x=-3,8
b) (-5,6).x+2,9.x-3,86 = -9,8
(-5,6+2,9).x-3,86=-9,8
-2,7.x-3,86=-9,8
-2,7.x=-9,8+3,86
-2,7.x=-5,94
x=-5,94:(-2,7)
x=2,2
![](https://rs.olm.vn/images/avt/0.png?1311)
a 3,2.x+(-1,2).x+2,7=4,9
[(3,2+(-1,2)].x+2,7=4,9
2.x+2,7 =4,9
2.x =4,9-2,7
2.x =2,2
x =2,2:2
x =1,1
b
![](https://rs.olm.vn/images/avt/0.png?1311)
a)3,2.x+(-1,2).x+2,7=-4,9
3,2+(-1,2).x+2,7=-4.9
2.x+2,7=-4,9
2.x=-4,9-2,7
2.x=-7,6
x=-7,6:2
x=-3,8
b)(-5,6).x+2,9.x-3,86=-9,8
(-5,6)+2,9.x-3,86=-9,8
-2,7.x-3,86=-9,8
-2,7.x=-9,8+3,86
-2,7.x=-5,94
x=-5,94:-2,7
x=2,2
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 3,2.x+1,2.x+2.7=-4,9
x.(3,2+1,2)= -4,9-2,7
x.4,4=-7,6
x=\(\frac{-7,6}{4,4}\)
x=\(\frac{-19}{11}\)
Vậy x=\(\frac{-19}{11}\)
b) -5,6.x+2,9.x-3,86=-9,8
x.(-5.6+2,9)=-9,8+3,86
x.(-2,7)=-5,94
x=\(\frac{-5,94}{-2,7}\)
x=\(\frac{11}{5}\)
Vậy x=\(\frac{11}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(3,2.x+\left(-1,2\right).x+2,7=-4,9\)
\(\Leftrightarrow2x=\text{– 4,9 – 2,7 }\)
\(\Leftrightarrow2x=-7,6\)
\(\Leftrightarrow x=-3,8\)
b, \(\left(-5,6\right).x+2,8.x-3,86=-9,8\)
\(\Leftrightarrow-2,7.x-9,8+3,86\)
\(\Leftrightarrow-2,7.x=-5,94\)
\(\Leftrightarrow x=2,2\)
b. (-5,6).x+2,9.x-3,86=-9,8
x.(-5,6+2,9)-3,86=-9,8
x.(-2,7)-3,86=-9,8
x.(-2,7)=(-9,8+3,86)
x.(-2,7)=-5,94
x=(-5,94):(-2,7)
x=2,2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3,2.x+\left(-1,2\right).x+2,7=-4,9\)
\(x.\left(-1,2+3,2\right)+2,7=-4,9\)
\(x.2+2,7=-4,9\)
\(x.2=-4,9-2.7\)
\(x.2=-7,6\)
\(x=-7,6:2=-3,8\)
\(\left(-5,6\right).x+2,9.x-3,86=-9,8\)
\(x.\left(-5,6+2,9\right)-3,86=-9,8\)
\(x.\left(-2,7\right)-3,86=-9,8\)
\(x.\left(-2,7\right)=-9,8+3,86\)
\(x.\left(-2,7\right)=-5,94\)
\(x=-5,94:\left(-2,7\right)\)
\(x=2,2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3,2x+\left(-1,2\right)x+2,7=-4,9\)
\(\Rightarrow x.\left[3,2+\left(-1,2\right)\right]=-4,9-2,7\)
\(\Rightarrow x.2=-7,6\)
\(\Rightarrow x=-7,6:2=-3,8\)
Vậy.............
b. \(-5,6.x+2,9.x-3,86=-9,8\)
\(\Rightarrow-2,7.x=-9,8+3,86\)
\(\Rightarrow-2,7.x=-5,94\)
\(\Rightarrow x=-5,94:\left(-2,7\right)=2,2\)
Vậy................
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(3,2.x+\left(-1,2\right).x+2,7=-4,9\)
\(\Leftrightarrow\left(3,2-1,2\right).x+2,7=-4,9\)
\(\Leftrightarrow2x=\left(-4,9\right)-2,7\)
\(\Leftrightarrow2x=-7,6\)
\(\Leftrightarrow x=\left(-7,6\right):2=-3,8\)
b) \(-5,6x+2,9x-3,86=-9,8\)
\(\Leftrightarrow\left(-5,6+2,9\right)x-3,86=-9,8\)
\(\Leftrightarrow\left(-2,7\right).x=-5,94\)
\(\Leftrightarrow x=\left(-5,94\right):\left(-2,7\right)=2,2\)
a.
x(3.2-1.2)+2.7=-49
2x=-49-2.7
x=-51.7:2
x=-25.85
b
x(-5.6+2.9)-3.86=-9.8
-2.7x=-9.8+3.86
x=-5.94:2
x=1.485
nhầm í b đáng nhẽ là x=-5.94:-2.7
x=2.2
đây là kết quả đúng ý b nha bạn