- ( 251 . 3 + 281 ) + 3 . 251 - ( 1 - 281 )
= - ( 753 + 281 ) + 753 - 1 + 281
= - 753 - 281 + 753 - 1 + 281
= ( -753 + 753 ) - ( -281 + 281 ) - 1
= 0 - 0 - 1 = -1
\(B=-\left(251+281\right)+3,251-\left(1-281\right)\)
\(B=-532+3,251-\left(1-28\right)\)
\(B=-532+3,251-\left(-27\right)\)
\(B=3783-\left(-27\right)\)
\(B=3810\)
\(-\left(251.3+281\right)+3.251-\left(1-281\right)\))
\(=-\left(753+281\right)+753-1+281\)
\(=-753-281+753-1+281\)
\(=\left(-753+753\right)-\left(-281+281\right)-1\)
\(0-0-1=-1\)
Học tốt nhé!k mình ngăn!
