当x = 2时,ax³ + bx - 5 = 7
代入得: 8x³ + 2x - 5 = 7
所以 8x³ + 2x = 12
所以 -8x³ -2x = -12
x = -2时,
ax³ + bx - 5
= -8a - 2b - 5
= -12 - 5
= -17
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