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lg的3次方 2+lg的3次方 5+3lg2*lg5 求值
人气:284 ℃ 时间:2020-09-20 00:16:38
解答
lg^3(2)+lg^2(5)+3lg2*lg5=(lg2)^3+(lg5)^3+3lg2*lg5=(lg2+lg5)[lg^2(2)-lg2*lg5+lg^2(5)]+3lg2*lg5=lg10[(lg2)^2-lg2*lg5+(lg5)^2]+3lg2*lg5=(lg2)^2-lg2*lg5+(lg5)^2+3lg2*lg5=(lg2)^2+2lg2*lg5+(lg5)^2=(lg2+lg5)...
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