48-(2x-10)=20
2x*(48-12x)-10*(48-12x)=0
2x*(48-12x)-10*(48-12x)=0
=> (48-12x).(2x-10)=0
=> 48-12x=0 hoặc 2x-10=0
=> 12x=48-0 hoặc 2x =0+10
=> 12x=48 hoặc 2x =10
=> x=48:12 hoặc x =10:2
=> x=4 hoặc x =5
2x*(48-12x)-10*(48-12x)=0
timf x thuộc N biết
a/ 321 + 2(x -4) = 2017
b/ 48 - 3(x +5) =24
c/1230 : 3(x-20) = 10
d/2x - 238 = 2^3 x 3^2
a/ 321 + 2(x -4) = 2017
2(x -4) =1696
x-4=848
x=852
b/ 48 - 3(x +5) =24
3(x +5)=24
x+5=8
x=3
c/1230 : 3(x-20) = 10
3(x-20)=123
x-20=41
x=61
d/2x - 238 = 2^3 x 3^2
2x - 238 =72
2x=200
x=100
a) \(321+2\left(x-4\right)=2017\)
\(2x-8=2017-321\)
\(2x-8=1696\)
\(2x=1704\)
\(x=852\)
vay \(x=852\)
b) \(48-3\left(x+5\right)=24\)
\(3x+15=48-24\)
\(3x+15=24\)
\(3x=9\)
\(x=3\)
vay \(x=3\)
c) \(1230:3\left(x-20\right)=10\)
\(3x-60=1230:10\)
\(3x-60=123\)
\(3x=183\)
\(x=61\)
vay \(x=61\)
d) \(2x-238=2^3.3^2\)
\(2x-238=8.9\)
\(2x-238=72\)
\(2x=310\)
\(x=155\)
vay \(x=155\)
a. 2x–20=35:33
b. x–48:16=37
\(2x-20=35:33\)
\(\Rightarrow2x-20=35.\dfrac{1}{33}\)
\(\Rightarrow2x=\dfrac{35}{33}+20\)
\(\Rightarrow2x=\dfrac{695}{33}\)
\(\Rightarrow x=\dfrac{695}{33}:2\)
\(\Rightarrow x=\dfrac{695}{66}\)
2x–20=35:33
2x-20=35/33
2x=35/33+20
2x=695/33
x=695/33:2
x=695/66
2x - (-17+x)=15-32
45-(x-11) =(-48) - 2x
17-(20-|x| ) = 117
2x - (- 17 + x) = 15 - 32
2x + 17 + x = -15
2x + x = -15 - 17
3x = - 32
3x = - 32
x = -32 : 3
x = \(\frac{-32}{3}\)
45 - (x - 11) = - 48 - 2x
25 - x + 11 + 2x = - 48
x + 11 + 2x = 25 - (- 48)
x + 11 + 2x = 25 + 48
x + 11 + 2x = 73
x + 2x = 73 - 11
3x = 62
x = 62 : 3
x = \(\frac{62}{3}\)
17 - (20 - |x| ) = 117
20 - |x| = 17 - 117
20 - |x| = -100
|x| = 20 - (-100)
|x| = 120
x = +-120
#ht
+)2x-(-17+x)=15-32
2x-(-17+x)=-7
2x+17+x=-7
3x=-24
x=-8
+)45-(x-11)=(-48)-2x
45-x+11=-48-2x
45+11+48=-2x +x
104=x
+)17-(20-/x/)=117
17-20+/x/=117
-20+/x/=117-17
-20+/x/=100
/x/=120
x=+-120
48 : 0,5 + 16 * 0,25 + 20 : 10 = ???
Hãy so sánh 10% của 20 và 20% của 10. Dựa vào nhận xét đó, hãy tính nhanh:
a) 25% của 48
b) 50% của 96
-10/3 + 13/10-1/6+7/10
1-20/6 +39/30-4/24+34/50
15/24-6/26+28/48-30/39+10/24
-5/10+12/28-3/27-7/18+20/35
a) 48 - 3(x + 5) = 24 e) 4x + 18 : 2 = 13
b) 2x+1 - 2x = 32 g) 2x - 20 = 35 : 33
c) (15 + x) : 3 = 315 : 312 h) 525.5x-1 = 525
d) 250 - 10(24 - 3x) : 15 = 244 k) x - 48 : 16 = 37