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a, X = 273
b, X = 156
c, X = 4
d, X = 505
e, X = \(\frac{37}{245}\)
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2087 - x :27 = 2015
x : 27 = 2087 - 2015
x : 27 = 72
x = 72 x 27
x = 1944
2087 - x : 27 = 2015
x : 27 = 2087 - 2015
x : 27 = 72
x =72 x 27
x =1944
45 x ( 463 + x ) = 44955
463 + x = 44955 : 45
463 + x = 999
x = 999 - 463
x = 536
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\(\Rightarrow1225+x:5=2015\\ \Rightarrow x:5=790\\ \Rightarrow x=3950\)
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X x 52 + X x 48 = 4200
=>Xx(52+48)=4200
Xx100=4200
X=4200:100
X=42
Vậy X=42
X x 52 + X x 48 = 4200
X x ( 52 + 48 ) = 4200
X x 100 = 4200
X = 4200 : 100
X = 42
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9900 : 36 - 15 x 11
= 275 - 165
= 110
9700 : 100 + 36 x 12
= 97 + 432
= 529
( 15792 : 336 ) x 5 + 27 x 11
= 47 x 5 + 297
= 235 + 297
= 532
( 160 x 5 - 25 x 4 ) : 4
= ( 800 - 100 ) : 4
= 700 : 4
= 175
1036 + 64 x 52 - 1827
= 1036 + 3328 - 1827
= 4364 - 1827
= 2537
215 . 869 + 215 . 14
= 215 . ( 869 + 14 )
= 215 . 883
= 189945
\(x.27+5483=11828\)
\(27x=6345\)
\(\Rightarrow x=235\)
\(x:52+2947=3051\)
\(x:52=104\)
\(\Rightarrow x=5408\)