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標題:
Math log question
發問:
9^x-2=4^3-2x thx........
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最佳解答:
9x-2 =43-2x log 9x-2 = log 43-2x (x﹣2) (log 9) = (3﹣2x) (log 4) (log 9) x﹣2 (log 9) = 3 (log 4) ﹣2(log 4)x (log 9) x + (log 16) x = (log 81) + (log 64) x = [(log 81) + (log 64)] / [(log 9) + (log16)] x = (log 5184) / (log 144) x = 1.72
其他解答:
9^(x-2)=4^(3-2x) 3^[2(x-2)]=2^[2(3-2x)] 2(x-2)log 3 =2(3-2x)log 2 xlog3-2log3=3log2-2xlog2 xlog3+2xlog2=3log2+2log3 x(log3+2log2)=3log2+2log3 x=(3log2+2log3)/(log3+2log2)//
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