Question

A = - ( 251 .3 + 281 ) + 3.251 - ( 1 - 281 )

Answer 1

-(251 . 3 + 281) + 3 .251 - (1 - 281 )

= -251 . 3 - 281 + 3 . 251 - 1 + 281

= ( 3 . 251 - 251 . 3 ) + ( 281 - 281 ) -1

= 0 + 0 - 1 = - 1

dễ mà bạn !!!

Answer 2

\(A=-(251.3+281)+3.251-(1-281)\)

\(A=(-251.3)+(-281)+251.3-1+281\)

\(A=3(-251+251)+(-281+281)-1\)

\(A=3.0+0-1\)

\(A=0-1\)

\(A=-1\)

Answer 3

\(A=-\left(251.3+281\right)+3.251-\left(1-281\right)\)

\(A=-251.3-281+251.3-1+281\)

\(A=\left(-251.3+251.3\right)+\left(-281+281\right)-1\)

\(A=-1\)

Chúc bạn học tốt!!!