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420:[75-(x*10)]=21
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420 : [ 75 - ( x - 10 )] = 21
75 - ( x - 10 )= 20
x-10=55
x=65
420 : [ 75 - ( x - 10 )] = 21
75 - ( x - 10 ) = 420 : 21 ( TSC )
75 - ( x - 10 ) = 20
x - 10 = 75 - 20 ( TST )
x - 10 = 55
x = 55 + 10 ( TSBT )
x = 65
\(420:\left(75-\left(x-10\right)\right)=21\)
\(75-\left(x-10\right)=420:21=20\)
\(x-10=75-20=55\)
\(x=55+10=65\)
420:[75-(x-10)]=21
[75-(x-10)]=420:21
75-(x-10)=20
(x-10)=75-20
x-10=55
x =55+10
x =65
k nếu thấy đúng
420:[75-(x-10)]=21
=> 75 - ( x-10) = 420 : 21 = 20
=> x -10 = 75 -20 = 55
=> x = 55 + 10 = 65
420 : [75 - (x - 10)] = 21
75 - (x - 10) = 420 : 21
75 - (x - 10) = 20
x - 10 = 75 - 20
x - 10 = 55
x = 55 + 10
x = 65
Vậy x = 65
420 : [ 75 - ( x - 10) ] = 21
75 - ( x - 10 ) = 420 : 21
75 - ( x - 10 ) = 20
x - 10 = 75 - 20
x -10 = 55
x = 55 + 10
x = 65
a) [ 25 - ( x + 1,85 ) ] : 3 = 7
[ 25 - ( x + 1,85) ] = 7x3
[ 25 - ( x + 1,85 ) ] = 21
x + 1,85= 25-21
x + 1,85= 4
x= 4-1,85
x= 2,15
a) [25 - (x + 1,85)] : 3 = 7
=> 25 - (x + 1,85) = 3 x 7
=> 25 - (x + 1,85) = 21
=> x + 1,85 = 25 - 21
=> x + 1,85 = 4
=> x = 4 - 1,85
=> x = 2,15
b) 420 : [75 - (x - 10)] = 21
=> 75 - (x - 10) = 420 : 21
=> 75 - (x - 10) = 20
=> x - 10 = 75 - 20
=> x - 10 = 55
=> x = 55 + 10
=> x = 65
(3/4+x).1/2=4/5
3/4+x=4/5:1/2
3/4+x=8/5
x=8/5-3/4
x=17/20
b)420:[75-(x-10)]=21
75-(x-10)=420:21
75-(X-10)=20
X-10=75-20
X-10=55
X=55+10
X=65
K ĐÓ NHÉ
420: [ 75- (x-10)]=21
75-(x-10)= 420 : 21
75-(x-10)=20
75-x+10=20
75-x =20-10
75-x =10
x =75-10
x =65
420 : (75 - (x - 10)) = 21
75 - (x - 10) = 420 : 21 = 20
x - 10 = 75 - 20 = 55
x = 55 + 10 = 65
a)Vì 50: x, 125:x, 75:x nên x \(\inƯCLN\left(50,125,75\right)\)
Ta có: 50=52.2
125= 53
75 = 52.3
ƯCLN( 50,125,75) = 52= 25
Vậy x = 25
b) Vì x:12, x:21, x:14 nên x \(\in BCNN\left(12,21,14\right)\)
Ta có: 12 = 3 . 22
21= 7.3
14 = 7.2
BCNN (12,21,14) = 7.3.22=84
Vậy x = 84
420:[75-(x*10)]=21
=> 75 - ( x*10) = 420 : 21 = 20
=> x *10 = 75 - 20 = 55
=> x = 55 : 10 = 5,5
\(420:\left[75-\left(x\cdot10\right)\right]=21\)
\(75-\left(x\cdot10\right)=420:21\)
\(75-\left(x\cdot10\right)=20\)
\(x\cdot10=75-20\)
\(x\cdot10=55\)
\(x=55:10\)
\(x=5,5\)