作业帮log (log2)^2 - (log4)(log20) + (log20)^2
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log (log2)^2 - (log4)(log20) + (log20)^2
log
(log2)^2 - (log4)(log20) + (log20)^2
log (log2)^2 - (log4)(log20) + (log20)^2
(log2)^2 - (log4)(log20) + (log20)^2
=(log2)^2 - 2 (log2)(log20) + (log20)^2
=[lg2-lg20]^2
=[-lg10]^2
=[-1]^2
=1
原式=(log2)^2 - 2(log2)(log20) + (log20)^2=（log2-log20)^2=（log10）^2=1
log (log2)^2 - (log4)(log20) + (log20)^2
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