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`2,15-x=3,05`
`x=2,15-3,05`
`x=-0,9`
Vậy `x=-0,9`
__________________
`0,12-(2x-5)=1,88`
`2x-5=0,12-1,88`
`2x-5=-1,76`
`2x=-1,76+5`
`2x=3,24`
`x=3,24:2`
`x=1,62`
Vậy `x=1,62`
__________________
`1,74-3,5:x=1,24`
`3,5:x=1,74-1,24`
`3,5:x=0,5`
`x=3,5:0,5`
`x=7`
Vậy `x=7`
2,15−x=3,052,15-x=3,05
x=2,15−3,05x=2,15-3,05
x=−0,9x=-0,9
Vậy x=−0,9x=-0,9
__________________
0,12−(2x−5)=1,880,12-(2x-5)=1,88
2x−5=0,12−1,882x-5=0,12-1,88
2x−5=−1,762x-5=-1,76
2x=−1,76+52x=-1,76+5
2x=3,242x=3,24
x=3,24:2x=3,24:2
x=1,62x=1,62
Vậy x=1,62x=1,62
__________________
1,74−3,5:x=1,241,74-3,5:x=1,24
3,5:x=1,74−1,243,5:x=1,74-1,24
3,5:x=0,53,5:x=0,5
x=3,5:0,5x=3,5:0,5
x=7x=7
Vậy x=7
1: \(\Leftrightarrow2x-1\in\left\{1;-1;2;-2;3;-3;4;-4;6;-6;8;-8;12;-12;24;-24\right\}\)
=>\(x\in\left\{1;0;\dfrac{3}{2};-\dfrac{1}{2};2;-1;\dfrac{5}{2};-\dfrac{3}{2};\dfrac{7}{2};-\dfrac{5}{2};\dfrac{9}{2};-\dfrac{7}{2};\dfrac{13}{2};-\dfrac{11}{2};\dfrac{25}{2};-\dfrac{23}{2}\right\}\)
2: =>x+6+9 chia hết cho x+6
=>\(x+6\in\left\{1;-1;3;-3;9;-9\right\}\)
hay \(x\in\left\{-5;-7;-3;-9;3;-15\right\}\)
3: =>2x+4+15 chia hét cho x+2
=>\(x+2\in\left\{1;-1;3;-3;5;-5;15;-15\right\}\)
=>\(x\in\left\{-1;-3;1;-5;3;-7;13;-17\right\}\)
`1,24.(-4,5)+1,24.(-5,5)`
`= 1,24 . [-4,5 +(-5,5) ]`
`= 1,24 . (-10)`
`=-12,4`