20. B.-40
21. D. 10
Cara terdapat pada gambar.
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20. B.-40
21. D. 10
Cara terdapat pada gambar.
b = 3×(7-7) = 0
c = 7 × (-7) = - 49
a + b + c = 9 + 0 - 49 = -40
21) a = 1
b = 4
c = 6
d = 4
e = 1
c + d = 6 + 4 = 10