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a) x+26=39+(-5)=34
x=34-26=8
b) IxI+50=(-I-26I)+76=(-26)+76=50
IxI=50-50=0
=> x=0
c) IxI+17=(-21)+19=-2
IxI=(-2)-17=-19
=> x thuộc tập hợp rỗng
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a/ -x + 8 = -17-30
-x + 8 = -47
-x = -47 - 8
-x = -55
x = 55
Vậy x = 55
b/ 35 – x = 37
x = 35 - 37
x = -2
Vậy x = -2
c/ (-19 – x) + 23 = -20
-19 – x = -20 - 23
-19 – x = -43
x = -19 - (-43)
x = 24
Vậy x = 24
d/ (x – 45) : 2 = -17
x – 45 = -17 * 2
x – 45 = -34
x = -34 + 45
x = 11
Vậy x = 11
a/ -x + 8 = -17-30
-x + 8 = -47
-x =-47 - 8
-x = -55
x = 55
Vậy x = 55
Phần a mình bị lỗi nên sửa lại nha
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Gọi số phải tìm là A
=>A=17m+5=19n+12 (với m,n thuộc N)
=>3A+2=51m+17=57n+38
=>3A+2=17(3m+1)=19(3n+2)
=>3A+2 chia hết cho cả 17 và 19
=>3A+2=323
=>A=107
Vậy A=107
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a)
13/4+x=2
x=2-13/4
x=-5/4
b)
2x.17/12=3/7
2x =3/7;17/12
2x =36/119
x =36/119 : 2
x =18/119
c)
2x.17/12=19/7
2x =19/7:17/12
2x =228/119
x =228/119;2
x =114/119
d)
1/2x + 5/6=-3
1/2x =-3-5/6
1/2x =-23/6
x =-23/6:1/2
x =-23/3
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17 (x - 5) (x - 19) (x - 2017) = 0
=> (x - 5) (x - 19) (x - 2017) = 0
=> \(\hept{\begin{cases}x-5=0\\x-19=0\\x-2017=0\end{cases}}\)
=> \(\hept{\begin{cases}x=5\\x=19\\x=2017\end{cases}}\)
ok mk nhé!! 5654645656767655787876876968234234354354646546565756756786876769764564
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\(a,-x+8=-17\)
<=>\(-x=\left(-17\right)-8\)
<=>\(-x=-25\)
<=>\(x=25\)
\(b,35-x=37\)
<=>\(x=35-37\)
<=>\(x=-2\)
\(c,-19-x=-20\)
<=>\(x=\left(-19\right)+20\)
<=>\(x=1\)
\(d,x-45=-17\)
<=>\(x=\left(-17\right)+45\)
<=>\(x=28\)
1.
a,-x+8=-17
-x=-17-8=-25
-x=-25
x=25
b,35-x=37
x=35-37
x=-2
c,-19-x=-20
x=-19--20
x=1
d,x-45=-17
x =-17+-45
x=-62
-17-|x-5|=-19
|x-5|=(-17)-(-19)
|x-5|=2
\(\Rightarrow\orbr{\begin{cases}x-5=-2\\x-5=2\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=3\\x=7\end{cases}}\)
Vậy x=3 hoặc x=7.