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(log2)^2 - (log4)(log20) + (log20)^2
=(log2)^2 - 2 (log2)(log20) + (log20)^2
=[lg2-lg20]^2
=[-lg10]^2
=[-1]^2
=1
=(log2)^2 - 2 (log2)(log20) + (log20)^2
=[lg2-lg20]^2
=[-lg10]^2
=[-1]^2
=1
1年前
8
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你能帮帮他们吗