(+5)+(-7)=? (-7)-(-12)+? (-7
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(+5)+(-7)=? (-7)-(-12)+? (-7) 如果设? 为A,呢条式等于 5-7=-7A+12-7A -2=-14A+12 -14=-14A 1=A 那个? 就是1了
(+5)+(-7)= -2
(+5)+(-7)=? (-7)-(-12)+? (-7) -2 = -7?+12-7? -14=-14? 1=? 2007-07-16 15:17:25 补充: ******
(+5)+(-7)=? (-7)-(-12)+? (-7) -2 = -7?+12-7? -14=-14? 1=?
(+5)+(-7)= -2
(+5)+(-7)=? (-7)-(-12)+? (-7) -2 = -7?+12-7? -14=-14? 1=? 2007-07-16 15:17:25 补充: ******
(+5)+(-7)=? (-7)-(-12)+? (-7) -2 = -7?+12-7? -14=-14? 1=?
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