(lg5)^2 + (lg2)*(lg50)=
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(lg5)^2 + (lg2)*(lg50)=
(lg5)^2 + (lg2)*(lg50)=
(lg5)^2 + (lg2)*(lg50)=
(lg5)^2 + (lg2)*(lg50)
=(lg5)^2 + (lg2)*(lg2*25)
=(lg5)^2 + (lg2)*(lg2+lg5^2)
=(lg5)^2 +2lg2lg5+(lg2)^2
=(lg5+lg2)^2
=(lg10)^2
=1
lg2(1+lg5)+(lg5)^2
计算:(lg5)^2 +lg2 *lg5
(lg5)^2+lg5.lg2=
2lg2(lg2+lg5)+2lg5得数
(lg2)^2+lg2*lg5+(lg5)^2=
lg2*lg50+lg5*lg20-2lg5*lg2
(lg5)平方+2*lg5*lg2+(lg2)平方
lg5(1-lg5)+2lg5根号2+lg2(1-lg5)
(lg2)^2+lg5*lg20
(lg2)^2+lg20*lg5
(lg5)^2+lg2*lg50
3+lg5+(lg2)^2
2lg5*lg2=
=(lg5)^2+lg2×lg5+lg2 =lg5×(lg5+lg2)+lg2麻烦问一下,这是咋做的
lg5+lg5*lg2+lg2*lg2
(lg^2)2+lg2*lg5+lg5
lg5^2+lg4+lg5*lg20+(lg2)^2
计算(lg5)^2+lg4*lg5+(lg2)^2