18 . [(8x + 10 ) : 5] + 12 = 490
18 . [(8x + 10 ) : 5] = 490 - 12
18 . [(8x + 10 ) : 5] = 478
[(8x + 10 ) : 5] = 478 : 18
( 8x + 10 ) : 5 = \(\frac{239}{9}\)
8x + 10 = \(\frac{239}{9}\) .5
8x + 10 = \(\frac{1195}{9}\)
8x = \(\frac{1195}{9}\) - 10
8x = \(\frac{1195}{9}-\frac{90}{9}\)
8x = \(\frac{1105}{9}\)
x = \(\frac{1105}{9}\)\(\div\)8
x = \(\frac{1105}{9}\) . \(\frac{1}{8}\)
x = \(\frac{1105}{72}\)
Tìm số nguyên x, biết
18 – x : 2 = - 23
tìm số nguyên x biết :
-7(x+10)+3(-5 - x) - 8x = 12
Tìm x thuộc Z, biết:
a, 8x . ( 2023 + x ) - 8x . ( x + 2024 ) = 56
b, 5 - 2025x = 9 - 2026 . ( x - 1 )
c, ( - 12 ) mũ 2 . x = 56 + 10 . 13x
d, - ( x - 32 + 11 ) = ( 21 - 33 - x + 7 )
e, - 2 . ( x + 6 ) + 6 . ( x + 10 ) = 8
Tìm số tự nhiên x,biết:
a)58 + 7x = 100
b) ( x –12):12=12
c) x -56 : 4= 16
d) 101 +(36 –4x) =105
e) 2(x-51) = 2.23+ 20
f) 10 -(x –3): 2 = 72–110
g) 2x –49 = 5.32h) [(8x -12) : 4].33= 36
i) 52x –3–2 . 52= 52. 3 k) (x3–7) : 4 = 5
Tìm x biết :\(\frac{x+10}{490}+\frac{x+20}{480}+\frac{x+30}{470}+\frac{x+40}{460}+\frac{x+50}{450}=-5\)
x+10\490 + x+20\480 + x+30\470 + x+40\460 + x+50\450
Tìm x
tìm các số nguyên x , biết
a, ( x+7) . (x-15)
b, 8x + (-7) . x = -33
c, -12 . ( x - 5) + 7 . (3 - x) = 5
d,(-2) . (x +1) - (x - 5) = -2x
e, (-2) . x + 5 = (-3) . (-3) + 8
g, -12x = 15.(-4) - 12
tìm x
11, (x+3)3 = 125
12, (2x)4 = 16
13, 32 : (3x - 2) = 23
14, 20 - 2(x + 4) = 23
15, 14 ⋮(2.x+3)
16, 30- [4(x - 2)+15] = 3
17, 27 : ( x - 1)= 32
18, (10 + 2x) : 42011= 42013
19, (x + 5) ⋮(x +2)
20,[(8x - 12) : 4].33=36
mong các bạn giúp mình ^^
