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阅读下列内容后，解答下列各题：几个不等于0的数相乘，积的符号由负因数的个数决定． 例如：考查代数式（x-1）（x-2）的值与0的大小 当x＜1时，x-1＜0，x-2＜0，∴（x-1）（x-2）＞0 当1＜x＜2时，x-1＞0，x-2＜0，∴（x-1）（x-2）＜0 当x＞2时，x-1＞0，x-2＞0，∴（x-1）（x-2）＞0 综上：当1＜x＜2时，（x-1）（x-2）＜0 当x＜1或x＞2时，（x-1）（x-2）＞0 （1）填写下表：（用“+”或“-”填入空格处） （2）由上表可知，当x满足______时，（x+2）（x+1）（x-3）（x-4）＜0； （3）运用你发现的规律，直接写出当x满足______时，（x-7）（x+8）（x-9）＜0． x＜-2 -2＜x＜-1 -1＜x＜3 3＜x＜4 x＞4 x+2 - + + + + x+1 - - + + + x-3 - - - + + x-4 - - - - + （x+2）（x+1）（x-3）（x-4） + -
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【简答题】Bruce shook his money box again. Nothing! He carefully counted the coins that lay on the bed. All that he had was $24.52. The which he wanted was at least $90. How on earth(究竟) was he going to get the...
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