Jwab dong pakai cara buat belajar ulangan plisss

No.3. 61.837+365.118+30.525= n +61.837
=61.837+365.118+30.525=(365.118+30.525)+61.837. jadi, jawabannya yang ,(d.)

no.4. 278.316+199.513+345.192=n
=278.316+(199.513+345.192)
=278.316+544.705
=823.021 (a.)