89.若直线ax + 3y +1 = 0 与直线 y = -3x - a 平行,则a =( ).
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139.
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97.已知点 P(4,9) 是线段 AB 的中点,且 ) ( ,6 A m ,,则m 和n的值分别为( ).
A. 4,-3
B. -4 ,-12
C. 6 ,12
D. 8 ,-12
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32.
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150.
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91.
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191.
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133.
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24.
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23.
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