90 + ( -45 ) =

90 + ( -45 ) =

Jawaban: 45

perhatikan perhitungan berikut:
a + (-b) = a – b
a – (-b) = a + b

Pembahasan:
= 90 + ( -45 )
= 90 – 45
= 45

Jadi, hasil dari 90 + ( -45 ) = 45