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2ax+9=5x+6b為一元一次方程. 一元一次方程解的情况為,唯一解,無解,或者無窮解. 條件為,方程有2個不同的解,對應為無窮多解的情况,此時應該保證,等式兩邊各項的係數對應相等. 則有2a = 5和6b = 9 則,a=5/2,b=3/2 (b-a)^2003 =(-1)^2003 = -1
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