lg2*lg50+2lg5-lg20-2
1个回答
lg2*lg50+2lg5-lg20-2
=(1-lg5)(1+lg5) +2lg5-(2-lg5)-2
= -(lg5)^2+3lg5-3
相关问题
lg2*lg50 + lg20*lg5 - 2lg5*lg2=?
求值lg2*lg50+lg5*lg20-lg100*lg2*lg5
lg2·lg50-lg5·lg20-lg4
lg 5 lg 20-lg 2*lg 50-lg 25
lg2*lg50-lg5*lg20-lg4
计算lg2lg50+lg25-lg5lg20=______．
求值：lg5•lg50-lg2•lg20-lg625=______．
lg5lg20-lg2lg50-lg25等于多少
化简：lg5lg20-lg2lg50-lg25=______．
lg^2 2+2lg5+lg2·lg50