x[3(x+1)(x-3)+2{x+4(x-7)}]?

2016-05-12 10:33 am

回答 (2)

2016-05-12 10:45 am

x [3(x + 1)(x - 3) + 2{x + 4(x - 7)}]
= x [3(x² - 2x - 3) + 2{x + 4x - 28}]
= x [3x² - 6x - 9 + 2x + 8x - 56]
= x [3x² + 4x - 65]
= 3x³ + 4x² - 65x

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2016-05-12 10:38 am

What?

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