一道高一对数题
1个回答
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[2lg(2)+lg(3)]/[1+1/2lg(0.36)+1/3lg(8)]
=[lg(2)²+lg(3)]/[lg(10)+1/2lg(0.6²)+1/3lg(2³)]
=[lg(4)+lg(3)]/[lg(10)+(1/2)(2)lg(0.6)+(1/3)(3)lg(2)]
=[lg(4*3)]/[lg(10)+lg(0.6)+lg(2)]
=[lg(12)]/[lg(10*0.6*2)]
=[lg(12)]/[lg(12)]
=1
=[lg(2)²+lg(3)]/[lg(10)+1/2lg(0.6²)+1/3lg(2³)]
=[lg(4)+lg(3)]/[lg(10)+(1/2)(2)lg(0.6)+(1/3)(3)lg(2)]
=[lg(4*3)]/[lg(10)+lg(0.6)+lg(2)]
=[lg(12)]/[lg(10*0.6*2)]
=[lg(12)]/[lg(12)]
=1
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