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27. Jaring-jaring balok.
28. 1 (Satu).
29. 3/4. Caranya: 0,75=75/100÷25/25=3/4.
30.51/1. Caranya:1/5+0,3+50%=1/5+3/10=
10/50+15/50=25/50÷25/25=1/2.
1/2+50%=1/2+50/100=200/200+10000/200=10200/200.
10200/200÷50/50=204/4÷2/2=102/2÷2/2=51/1.
Maaf cuma bisa jawab segitu. Aku kurang yakin sama jawabanku yang nomor 30. Maaf ya, kalo salah. Semoga bermanfaat. ^^