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p : l
8 : 5
K = 2(p +l)
K : 2 = p + l
78 : 2 = p + l
39 = p + l
maka
p = 8/(8+5) x 39 = 8/13 x 39 = 8 x 3 = 24 m
l = 5/(8+5) x 39 = 5/13 x 39 = 15 m
L = p x l
L = 24 m x 15 m = 360 m²
jadi jawaban = B
nomor 2
71 + (-2 x 7) : (-12 : 4)
71 + (-14 : -3)
71 + 4 2/3
75 2/3