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11. Efetue as operações com monômios. a) 5x - 3x + 7x - x = b) 3a²b³-7a²b³ + 4a²b³ - a²b³ = c) -2mn² - (-5mn²) - (+4mn²) - mn² = d) 3ax. 5ay = e) (-4by³) (+7b²y²) = f) g) (-18x7y³): (-3x³y²) = h) 15 3 - pq 97):(+2pq²)=​
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