化简：3a²-2a+2a²-a
To simplify the expression 3a² - 2a + 2(a² - a), we can distribute the 2 to the terms inside the parentheses:
3a² - 2a + 2(a² - a) = 3a² - 2a + 2a² - 2a = (3a² + 2a²) + (-2a - 2a) = 5a² - 4a
Therefore, the simplified expression is 5a² - 4a.
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