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no 3
I 2 x 4 - 10 I + I 1 - 2 x 3 I x I 1 + 2 I
I -2 I + I -5 I x I3I
2 + 15 = 17
no 5
I-aI x IaI - I-a²I x (-2)
a² - a² x (-2)
a² + 2a²
3a²