(x trừ 105) nhân 5 =6
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( x - 105 ) : 5 = 6
( x - 105 ) = 6 x 5 = 30
x = 30 + 105 = 135
Vậy x= 135
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5\times x-x+6\times x=140\)
\(5\times x+x\times1+6\times x=140\)
\(\left(5-1+6\right)\times x=140\)
\(10\times x=140\)
\(x=140:10\)
\(x=14\)
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`a, 6 xx (7-5) = 6 xx 2 = 12`
`6 xx 7 - 6 xx 5 = 42 - 30 = 12`.
`b, 3 xx 5 - 3 xx 4= 3`
` 3 xx (5-4) = 3`
`c, 28 xx (10-1) = 28 xx 9 = 252`
`(100 - 1) xx 36 = 3600 - 36 = 3564`
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)\left(1-\frac{1}{5}\right)\left(1-\frac{1}{6}\right)\)
\(=\left(\frac{2-1}{2}\right)\left(\frac{3-1}{3}\right)\left(\frac{4-1}{4}\right)\left(\frac{5-1}{5}\right)\left(\frac{6-1}{6}\right)\)
\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.\frac{4}{5}.\frac{5}{6}\)
\(=\frac{1}{6}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
7(x-3)-5(3-x)=11x-5
<=>7(x-3)+5(x-3)=11x-5
<=>(7+5)(x-3)=11x-5
<=>12(x-3)=11x-5
<=>12x-36=11x-5
<=>12x-11x=-5+36
<=>x=31
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
5,26 x 1,5 - x = 4,6
=> 7,89 - x = 4,6
=> x = 7,89 - 4,6
=> x = 3,29
x=135
x=135
Thích thì L_I_K_E