1g2的平方+1g2*1g50+1g25

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1g2的平方+1g2*1g50+1g251g2的平方+1g2*1g50+1g251g2的平方+1g2*1g50+1g25=lg²2+lg2*(2-lg2)+2(1-lg2)=lg²

1g2的平方+1g2*1g50+1g25
1g2的平方+1g2*1g50+1g25

1g2的平方+1g2*1g50+1g25
=lg²2+lg2*(2-lg2)+2(1-lg2)
=lg²2+2lg2-lg²2+2-2lg2
=2

1g2的平方+1g2*1g50+1g25
=1g2的平方+1g2*(1+1g5)+21g5
=1g2的平方+lg2+1g2*1g5+21g5
= 1g2(lg2+lg5)+lg2+21g5
=2lg2+2lg5
=2