Dijawab No. 4 dan 5 dengan caranya.
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Mapel : MatematikaKelas : VIII SMP
Bab : Aljabar dasar
Pembahasan :
4.
a. -p + 9r - (-8p - 7r)
= -p + 9r + 8p + 7r
= 7p + 16r
b. -4m + 7n - (-m² + 6n - 5)
= -4m + 7n + m² - 6n + 5
= m² - 4m + n + 5
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5.
Keliling = 50
AB + AC + BC = 50
AB + 2(2p + 5) = 50
AB + 4p - 10 = 50
AB = (60 - 4p) meter