7 x X - X x 2 = 1,85
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Ta có: x : 25 - [ x + 1,85 ] : 3 = 7
=> 25 - [ x + 1,85 ] = 7 x 3
=> 25 - [ x + 1,85 ] = 21
=> [ x + 1,85 ] = 25 - 21
=> x + 1,85 = 4
=> x = 4 - 1,85
=> x = 2,15
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a, X:6x4=1,248 =>X=1,248:4x6=1,872
b,7xX-2xX=1,85 =>5xX=1,85 =>X=1,85:5=0,37
c,Xx1000=499,7 =>X=499,7:1000=0,4997
d, 100xX=273,5 =>X=273,5:100=2,735
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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
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0.48 x X x 0.1 = 96 X : 52 : 0.01 = 23.6-1.85
0.48 x X = 96: 0.1 X : 52 : 0.01 = 21.75
0.48 x X = 960 X : 52 = 21.75 *0.01
X = 960 : 0.48 X : 52 = 0.2175
X = 2000 X = 0.2175 *52
X = 11.31
x X (7-2) = 1,85
x X 5= 1,85
x = 1,85 : 5
x = 0,37
x = 0,37