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a, => -12+x-9 = 0
=> x-21=0
=> x=21
b, => -32-x+5 = 0
=> -x-27 = 0
=> -x=27
=> x=-27
c, => 11+15-x = 1
=> 26-x=1
=> x = 26-1 = 25
Tk mk nha
-12 + (x -9)=0 -32 - (x -5)=0 11 + (15- x )= 1
x -9 =0 +12 x -5 =0-32 15 - x =1 - 11
x -9 =12 x -5 = -32 15 -x =-10
x = 12+9 x = ( -32)+5 x = 15 +10
x =2 x = -27 x =25
a) -32 -4.(x-5) = 0
<=>4.(x-5)=-32
<=>x-5=(-32):4
<=>x+5=-8
<=>x=-8+5
<=>x=-3
Vậy x=-3
b) 13.(x-5)=-169
<=>x-5=(-169):13
<=>x-5=-13
<=>x=-13+5
<=>x=-8
vậy x=-8
c) (-2).x+5 = (-3).(-3)+8
<=>(-2).x+5=17
<=>(-2).x=17-5
<=>(-2).x=12
<=>x=12:(-2)
<=>x=-6
Vậy x=-6
d) (-8).x = (-10).(-2)-4
<=>(-8).x=16
<=>x=16:(-8)
<=>x=-2
vậy x=-2
e) (-9).x+3 = (-2).(-7)+16
<=>(-9).x+3=30
<=>(-9).x=30-3
<=>(-9).x=27
<=>x=27:(-9)
<=>x=-3
Vậy x=-3
a)\(\left(x-140\right)\)\(\div\)7=27-4-3 =20\(\Rightarrow\) \(\left(x-140\right)\) =20x7=140\(\Rightarrow\) x=0
bài 1
16*25*5*125*2*12
=16*125*125*24
=16*(125*125)*24
=16*15625*24
=6000000
bài 2
a) x+37=121
x =121-37
x =84
b) 31+x+29=189
31+x =189-29
31+x = 160
c)129+x=170
x =170-129
x= 41
d) x-32*27=0
x-32 =0:27
x-32 =0
x =0+32
x =32
e)(x-3)*14=28
x-3 =28:14
x-3 =2
x =2+3
x =5
f) 15*x+2=45
15*x =45-2
15*x =43
x =43:15
x =\(\frac{43}{15}\)
g) (39-x)*32=32
39-x =32:32
39-x =1
x =39-1
x =38
h) (x-27)-145=0
x-27 =0+145
x-27 =145
x =145+27
x =172
chúc bạn học tốt
b, -32 - ( x - 5) = 0
=> -32 - x + 5 = 0 => -27 - x = 0
x = -27
c, -12 + (x - 9) = 0
=> -12 + x - 9 =0 => x - 21 = 0
x = 21
d, 11 + (15 - x) = 1
=> 11 + 15 - x = 1 => 26 - x = 1
x = 25
Tìm x:
b/ - 32 - (x – 5) = 0
x – 5 = -32 - 0
x – 5 = -32
x = -32 + 5
x = -27
c/ - 12 + (x – 9) = 0
x – 9 = 0 + 12
x - 9 = 12
x = 12 + 9
x = 21
d/ 11 + (15 – x) = 1
15 – x = 1 - 11
15 – x = -10
x = 15 - (-10)
x = 25
a, \(\left(7.4^x+8.4^{x+1}\right).5=3120\)
\(7.4^x+8.4^x.4=3120:5\)
\(4^x\left(7+32\right)=624\)
\(4^x=624:39\)
\(4^x=16=4^2\)
\(\Rightarrow x=2\)
b, \(2018^2.2018^x=2018^6\)
\(2018^x=2018^6:2018^2=2018^4\)
\(\Rightarrow x=4\)
c, \(3^{x-2}-19=62\)
\(3^x:3^2=62+19\)
\(3^x=81.9=729=3^6\)
\(\Rightarrow x=6\)
d, \(5^{x+2}-5^{x+1}=2500\)
\(5^x\left(25-5\right)=2500\)
\(5^x=2500:20=125=5^3\)
\(\Rightarrow x=3\)
e, \(\left[\left(46-32\right)^2-\left(54-42\right)^2\right].2x-1872=0\)
\(\left[14^2-12^2\right].2x=1872\)
\(\left[196-144\right].2x=1872\)
\(52.2x=1872\)
\(2x=1872:52=36\)
\(\Rightarrow x=36:2=18\)
:)))
HỌC TỐT !
a) ( 7. 4x + 8 . 4x+1 ) . 5 = 3120
=> 7 . 4x + 8 . 4x . 41 = 624
=> 4x ( 7 + 8 . 4 ) = 624
=> 4x . 39 = 624
=> 4x = 16
=> 4x = 42
=> x = 2
b) 20182 . 2018x = 20186
=> 2018x = 20184
=> x = 4
c) 3x-2 - 19 = 62
=> 3x-2 = 81
=> 3x-2 = 34
=> x - 2 = 4
=> x = 6
d) 5x+2 - 5x+1 = 2500
=> 5x . 52 - 5x . 5 = 2500
=> 5x ( 52 - 5 ) = 2500
=> 5x . 20 = 2500
=> 5x = 125
=> 5x = 53
=> x = 3
e) [ ( 46 - 32 )2 - ( 54 - 42 )2 ] . 2x - 1872 = 0
=> [ 142 - 122 ] . 2x = 1872
=> [ 196 - 144 ] . 2x = 1872
=> 52 . 2x = 1872
=> 2x = 36
=> x = 18
\(-32x+12x-5x=900\)
\(x\left(-32+12-5\right)=900\)
\(x\cdot\left(-25\right)=900\)
\(x=-36\)
\(\left(-32\right).x+12.x-5.x=900\)
\(\left(-32+12-5\right).x=900\)
\(-25x=900\)
\(x=900:\left(-25\right)\)
\(x=\left(-36\right)\)
-32-(x-5)=0
x-5=-32-0
X-5=-32
X=-32+5
X=-27
x-5=-32+0
x-5=-32
x=-32+5
x=-27