(lg5)2+2lg2-(lg2)2=?
lg2^2+lg2*lg5+lg5=lg2(lg2+lg5)+lg5
lg5+2lg2+(lg2)=?
(lg5)2+lg2*lg5=?
(lg2)^2+lg2*lg5+(lg5)^2=
(lg5)2+2lg2-(lg2)2=?
(lg5)^2+lg5.lg2=
2lg5*lg2=
=(lg5)^2+lg2×lg5+lg2 =lg5×(lg5+lg2)+lg2麻烦问一下,这是咋做的
如何将(lg2)²+(2lg2+lg5)×lg5变成(lg2)2+2lg2lg5+(lg5)²
lg5^2+2lg2-lg2^2=?
lg^2 5+lg2*lg5+lg2=?
lg50+lg2*lg5+(lg2)^2=