(x+1,5)×4=22,
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- 9/4 : (x-22/3)=-1,5
- x-22/3=9/4 : -1,5
- x-22/3=-1,5
- x=-1,5+22/3
- x=35/6
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\frac{1}{3}+\frac{6}{11}.\frac{22}{5}-\frac{3}{4}:1,5=\frac{1}{3}+\frac{6.2}{5}-\frac{3}{4}:\frac{3}{2}=\frac{1}{3}+\frac{12}{5}-\frac{1}{2}=\frac{10}{30}+\frac{72}{5}-\frac{15}{30}=\frac{67}{30}\)
\(b, 3.3,5.6+2.6,4.9+1,8=18.3,5+18.6,4+1,8=18\left(3,5+6,4\right)+1,8=18.9,9+1,8=1,8.99+1,8=1,8\left(1+99\right)=1,8.100=180\)
b ) 3 x 3,5 x 6 + 2 x 6,4 x 9 + 1,8
= 18 x 3,5 + 18x 6,4 + 18 x 0,1
= 18 ( 3,5 + 6,4 + 0,1)
= 18 x 10
= 180
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x * 1,5 + x * 4= 22
x * ( 1,5 + 4) =22
x * 5,5= 22
x = 22 : 5,5
x= 4
Vậy x =4
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(22:\frac{0,1}{1,5}.2+0,25.\frac{4}{5,6}:2,8\right)-\left(\frac{1}{2}\right)^2\)
= \(\left(22:\frac{1}{15}.2+\frac{1}{4}.\frac{5}{7}:\frac{14}{5}\right)-\frac{1}{4}\)
= \(\left(22.15.2+\frac{1}{4}.\frac{5}{7}.\frac{14}{5}\right)-\frac{1}{4}\)
=\(\left(660+\frac{1.5.14}{4.7.5}\right)-\frac{1}{4}\)
= \(\left(660+\frac{1}{2}\right)-\frac{1}{4}\)
= \(\left(\frac{1320+1}{2}\right)-\frac{1}{4}\)
=\(\frac{1321}{2}-\frac{1}{4}\)
=\(\frac{2642-1}{4}\)
=\(\frac{2641}{4}\)
= 660,25
Kkkkkk
(x+1,5)x4=22
x+1,5 =22:4
x+1,5 =5,5
x =5,5-1,5
x = 4
Thấy đúng thì nhấp đúng cho mình nha !