256.a+256.71=25600
256.(a+71)=25600
a+71=100
a=29
256 x a + 256 x 71 = 25600
256 x ( a + 71 ) = 25600
( a + 71 ) = 25600 : 256
( a + 71 ) = 100
a = 100 - 71
a = 29
256 x a + 256 x 71 = 25600
( a + 71 ) x 256 = 25600
a + 71 = 25600 : 256
a + 71 = 100
a = 100 - 71
a = 29
Vậy a = 29.
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256xa+256x71=25600
256x(a+71)=25600
(a+71)=25600:256
(a+71)=100
a=100-71
a=29
256×x+256×71=25600
256×x+18176=25600
256×x=25600-18176
256×x=7424
X=7424÷256
X= 29