方程组与不等式组卷二内容摘要:
B. baab C. 2ba D. ba1 6.将 a 克食盐溶入 b 克水中,得到甲种溶液,再将 c 克食盐溶入 d 克水中,得到乙种溶液,那么甲,乙两种溶液混合后的浓度为: A. dcba B. db ca C. )(21 dc cab a D. dcba ca 二、填空题(共 36 分,每空 4 分) 7.已知方程 ax21 的根为 _ _ _ _ _ _ _ _,12 ax 则 8.当 ______x 时,分式 1 542 x xx 的值为零;当 ______x 时, 分式 13 2。方程组与不等式组卷二
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