No 4 dan 7 tolong pakai cara

4. 3 + 3 3/4 + 4 1/2 + 5 1/4
= 3 + 15/4 + 9/2 + 21/4
= 3 + 15/4 + 18/4 + 21/4
= 3 + 54/4
=57/4

7. 4+3 1/2 +3+ 2 1/2
=4+7/2+3+5/2
=7+12/2
=7+6
=13

maaf klo slh