x + 2587 = 7531
=> x = 7531 - 2587 = 4944
x + 154 = 458
=> x = 458 - 154 = 304
x - 145 = 182
=> x = 182 + 145 = 327
*) x+2587=7531
=> x=7531-2587
=> x=4944
*) x+154=468
=> x=468-154
=> x=314
*) x-145=182
=> x=182+145
=> x=327
x + 2587 = 7531
x = 7531 - 2587
x = 4944
x + 154 = 458
x = 458 - 154
x = 304
x - 145 = 182
x = 182 + 145
x = 327
x + 2587 = 7531
x =7531 - 2587
x = 4944
x + 154 =458
x = 458-154
x =304
x - 145= 182
x= 182 +145
x= 327
trả lời:
x + 2587= 7531
x= 7531 - 2587
x= 4944
x + 154 = 458
x= 458 - 154
x= 304
x - 145 = 182
x= 182 + 154
x=327
học tốt!!!!!!!!!