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4)nggak tahu.
5)4x/y÷8x/2y=4x/y×2y/8x=8xy/8xy.
kalo mau disederhanakan, caranya:8xy÷4/8xy÷4=2xy/2xy.
6)5/8a×2a/10=10a/80a.
8)3(a+2b+4c)+5 (2a+3b+4c)
=3a+6b+12c+10a+15b+20c
=3a+10a+6b+15b+12c+20c
=13a+21b+32c.
maaf ya kalo salah.