lg20和2谁大

lg20和2谁大 2lg5+lg20=?lg5*lg20=? (lg2)^2+lg5*lg20 (lg2)^2+lg20*lg5 lg5·lg20+(lg2)^2 lg4+lg5.lg20+(lg5)2 lg4+lg5.lg20+(lg5)2 谁给我解释下log之间的乘法和平方就比如说lg5·lg20怎么求,lg^22 (就是lg的平方2)怎么求? lg5^2+lg4+lg5*lg20+(lg2)^2 (lg2)^2+lg20*lg5+(lg5)^2 （lg2)^2+lg5·lg20-1=? (lg2)^2 lg5×lg20－1 lg5^2+lg4+lg5*lg20+(lg2)^@ lg2*lg50+lg5*lg20-2lg5*lg2 7*lg20×(1/2)*lg0.7= lg5^2+2/3lg8+lg5*lg20+(lg2)^2 lg5*lg20怎么办啊 高中对数计算题lg20+2/3lg8+lg5乘lg20+lg^2乘2 化简lg25+2/3lg8+lg5×lg20+(lg^2)2