计算:(lg2)2+3lg5+lg5(1+lg2)+lg8+log2(5)log5(4)
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计算:(lg2)2+3lg5+lg5(1+lg2)+lg8+log2(5)log5(4)
计算:(lg2)2+3lg5+lg5(1+lg2)+lg8+log2(5)log5(4)
计算:(lg2)2+3lg5+lg5(1+lg2)+lg8+log2(5)log5(4)
原式
= (lg2)^2+3lg5+(lg5+lg5lg2)+lg2^3+log2(5)log5(2^2)
= (lg2)^2+lg5lg2+(lg5+3lg5)+3lg2+2log2(5)log5(2)
= (lg2+lg5)lg2+4lg5+3lg2+2(lg5/lg2)(lg2/lg5)
= lg2+3lg2+4lg5+2
= 4(lg2+lg5)+2
= 4+2
= 6
计算:(lg5)^2 +lg2 *lg5
2lg5+(lg2)^3*(2lg5+lg2)计算~
lg2(1+lg5)+(lg5)^2
lg5(1-lg5)+2lg5根号2+lg2(1-lg5)
计算:(lg2)2+3lg5+lg5(1+lg2)+lg8+log2(5)log5(4)
计算(lg5)^2+lg4*lg5+(lg2)^2
(lg2)^3+(lg5)^3+lg5*lg8=(lg2+lg5)[(lg2)^2-lg2*lg5+(lg5)^2]+lg5*lg2^3=1[(lg2)^2-lg2*lg5+(lg5)^2]+3lg5*lg2=(lg2)^2+(lg5)^2+2lg5*lg2=(lg2+lg5)^2=1网上看了看答案,可是第一步没有看懂.求得出第一步的过程,
lg2+lg5=?1-lg2=?1-lg5=?2lg5+2/3lg8+lg5*lg20+(lg2)2=?
3+lg5+(lg2)^2
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
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lg2-lg5/lg4-lg5=2lg2-1/3lg2-1 为什么?
(lg5)^2+lg5.lg2=
求解3lg5+3lg2*lg5+3lg2^2~