28+34 - 44+52
=(28+52)+(34-44)
=80-10=70
28+34-44+52
=(28+52)+(44-34)
=80+10
=90
28+34-44+52 = (28+52) - (44-34)
= 80 - 10
= 70
câu trên mk làm sai thì thôi nhé
28 + 34 - 44 + 52
=|28 + 52| + |34 - 44|
=80 + |-10|
=70
sorry mik ko co dau mo ngoac nen dung tam hihi
28 + 34 - 44 + 52
= ( 28 + 52 ) - ( 44 + 34 )
= 80 - 78
= 2
28+34-44+52
=(28+52)+(34-44)
=80+-10=70
28 + 34 - 44 + 52
= ( 28 + 52 ) + ( 34 - 44 )
= 80 + ( - 10 )
= 70
28 + 34 - 44 + 52
= ( 28 + 52 ) + ( - 44 + 34 )
= 80 + ( - 10 )
= 70
28 + 34 - 44 + 52
= ( 28 + 52 ) - ( 44 - 34 )
= 80 - 10
= 70
28 + 34 - 44 + 52
= ( 28 + 52 ) + ( 34 - 44 )
= 80 + ( - 10 )
= 70
= ( 28 + 52 )-(44-34)
= 80 - 10
= 70
hok tốt