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soalnya kurang jelas adee
20)
(a-b)(a+b+3)
= a(a+b+3) -b(a+b+3)
= a^2 + ab + 3a - ab - b^2 -3b
= a^2 - b^2 + 3a - 3b
21)
{5(x+3) + 3(x-3)} / 15
= (5x + 15 + 3x - 9 ) / 15
= (8x + 6) / 15
22)
4xy/3z * 9xy/10xy = 36x^2y^2 / 30xyz
= 6xy/5z
23)
abc/bc x abc/ac x abc/ab = a x b x c = abc
24)
4xy/7z * 14x^2y/6y^2 = 4x^3/3z
25)
(3p+2) + (4p+4) + (2p-1) = 9p + 5