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= 21/30 + 4/30
= 25/30 = 5/6
6/9 + n = 3/4
n = 3/4 - 6/9
n = 27/36 - 24/36
n = 3/36 = 1/12
1/2 + 1/4 + 1/6 = ? dijadikan per 12
= 6/12 + 3/12 + 2/12
= 11/12
n - 2/5 = 6/10
n = 6/10 + 2/5
n = 6/10 + 4/10
n = 10/10 = 1
4/5 - 1/2 + 1/4 = ... (jadikan per 20)
= 16/20 - 10/20 + 5/20
= 6/20 + 5/20
= 11/20
1/6 + 2/9 + 5/24 adalah... (jadikan per 72)
= 12/72 + 16/72 + 15/72
= 43/72
(bisa diperkecil lagi dibagi 5)= 5/6
2) 6/9+n =3/4
n= 3/4-6/9
n= 27/36 -24/36
n= 2/36 atau 1/18
3) 1/2+1/4+1/6 = 6/12+3/12+2/12=11/12
4) n-2/5=6/10
n=6/10+2/5
n= 12/20+8/20=20/20= 1
n=1
5) 4/5-1/2+1/4= 16/20-10/20+5/20
=6/20+5/20=11/20
yg no 6 sama kek yg lain samakan dlu penyebutnya baru bisa dijumlahkan