sederhanakan! 1. 7a(1+b)-3b(1+a)? 2. 3b-bx: cx-3c? 3. x2-5x-6: x+1

1. 7a(1+b)-3b(1+a) = (7a+7ab)-(3b+3ab) = 7a+7ab-3b-3ab = 7a-3b+(7ab-3ab) =7a-3b+4ab
2. (3b-bx) : (cx-3c) = b(3-x) : c(x-3) = b(3-x) : (-c)(3-x) = -(b/c)
3. (x^2-5x-6) : (x+1) = (x-6)(x+1) : (x+1) = (x-6)

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