lg2·lg50-lg5·lg20-lg4
1个回答
原式=lg2(1+lg5)-lg5(1+lg2)-2lg2
=lg2+lg2lg5-lg5-lg2lg5-2lg2
=-(lg2+lg5)
=-lg10
=-1
相关问题
lg2*lg50-lg5*lg20-lg4
lg2*lg50 + lg20*lg5 - 2lg5*lg2=?
lg 5 lg 20-lg 2*lg 50-lg 25
求值lg2*lg50+lg5*lg20-lg100*lg2*lg5
计算lg2lg50+lg25-lg5lg20=______．
lg2*lg50+2lg5-lg20-2
求值：lg5•lg50-lg2•lg20-lg625=______．
lg5lg20-lg2lg50-lg25等于多少
化简：lg5lg20-lg2lg50-lg25=______．
lg5^2+lg4+lg5*lg20+(lg2)^@