(lg2)²+(lg5)²+lg2xlg5=?(lg2)²+(lg5)²+lg2xlg5=?麻烦您把步骤也写上
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(lg2)²+(lg5)²+lg2xlg5=?(lg2)²+(lg5)²+lg2xlg5=?麻烦您把步骤也写上(lg2)²+(lg5)²+l
(lg2)²+(lg5)²+lg2xlg5=?(lg2)²+(lg5)²+lg2xlg5=?麻烦您把步骤也写上
(lg2)²+(lg5)²+lg2xlg5=?
(lg2)²+(lg5)²+lg2xlg5=?麻烦您把步骤也写上
(lg2)²+(lg5)²+lg2xlg5=?(lg2)²+(lg5)²+lg2xlg5=?麻烦您把步骤也写上
(lg2)²+(lg5)²+2 lg2xlg5 加了一个2
=(lg2)²+(1-lg2)²+2lg2x(1-lg2)
=lg²2+1-2lg2+lg²2+2lg2-2lg²2
=1
其中lg5=lg(10/2)=lg10-lg2=1-lg2