A) 23 + [(-3) - (-7)] - [ -8 + (-9) - 5]
= 23 + [ - 3 + 7 ] - [ - 8 - 9 - 5 ]
= 23 + 4 - [ - 22]
= 27 + 22
= 49
B)( 2020 + 54) - (2020 - 46)
= 2020 + 54 - 2020 + 46
= ( 2020 - 2020 ) + ( 54 + 46 )
= 0 + 100
= 100
Học tốt
@Chiyuki Fujito.
a, 23 + [ ( - 3 ) - ( - 7 ) ] - [ - 8 + ( - 9 ) - 5 ]
= 23 + 4 - ( - 22 )
= 49
b, ( 2020 + 54 ) - ( 2020 - 46 )
= 2074 - 1974
= 100
a)23+[(-3)-(-7)]-[-8+(-9)-5]
=23+(-10)-(-12)
=13-(-12)
=25
b)(2020+54)-(2020-46)
=2074-1974
=100
