(lg5)^2 +2(lg)^2 +1-(lg2)^2
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(lg5)^2+2(lg)^2+1-(lg2)^2(lg5)^2+2(lg)^2+1-(lg2)^2(lg5)^2+2(lg)^2+1-(lg2)^2=lg²5-lg²2+2lg2
(lg5)^2 +2(lg)^2 +1-(lg2)^2
(lg5)^2 +2(lg)^2 +1-(lg2)^2
(lg5)^2 +2(lg)^2 +1-(lg2)^2
=lg²5-lg²2+2lg2
=(lg5+lg2)×(lg5-lg2)+2lg2
=lg5-lg2+2lg2
=lg5+lg2
=1
lg2×lg5=?lg2×lg5=lg?求问号..是lg(2+5)吗?
对数lg2*lg5=?2lg(5)+2/3 lg8+lg5*lg20+lg2 =lg5^2+lg8^(2/3)+lg5*(lg4+lg5)+lg2 =lg100+lg5+2lg2*lg5+lg2 =2+(lg5+lg2) =2+1 =3 第二个等号lg5*(lg4+lg5)为什么=lg5+2lg2*lg5
2(log√2)+lg√2*lg5+√(lg√2)-lg2+1
(lg^2)2+lg2*lg5+lg5
lg²2+lg2×lg5+lg5
2(lg根号2)平方+lg根号2*lg5+根号[(lg根号2)平方-lg2+1]
2(lg根号2)²+lg根号2*lg5+lg(5根号2)=?
1.2(lg根号2)平方+lg根号2*lg5+根号下【(lg根号2)平方-lg2+1】
(lg²2-lg2*lg5+lg²)+3lg2*lg5
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