Jawabanmu

2014-09-10T08:59:39+07:00
1.    -5(3y - 10 ) = -15 y + 50
2.    -3y.(2x+3 ) = - 6 xy - 9 y
3 .    2x.(-3x+2) = -6x^2 + 4x
4 .   3y.(-2+3y ) = -6y + 9y^2


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