lg2乘lg2
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等于2再答:再答:给个好评哈
lg2的平方加lg5的平方加lg2乘lg25=lg2的平方加lg5的平方加2倍lg2乘lg5=(lg2+lg5)²=1再问:请问你是怎么算的啊、我不明白哎再答:就是一个公式(a+b)&sup
(lg5)^+lg2xlg50=lg5^+lg2x(lg2+2lg5)=lg5^+lg2^+2lg2lg5=(lg5+lg2)^2=(lg10)^2=1
2+lg5xlg2+lg5+(lg2)^2=2+lg(10/2)xlg2+(lg2)^2+lg5=2+(lg10-lg2)xlg2+(lg2)^2+lg5=2+lg2+lg5=2+lg(2x5)=3
lg2^2+lg2*lg5+lg5=lg2(lg2+lg5)+lg5=lg2(lg2*5)+lg5=lg2*1+lg5=lg2*5=1
(lg5)^2+lg2*lg50=lg5*lg5+lg2*(lg5+lg10)=lg5*lg5+lg2*(lg5+1)=lg5*lg5+lg2*lg5+lg2=lg5(lg5+lg2)+lg2[这一步
lg2+lg2=2lg2,lg50+lg25=(lg5*10)+lg5*5=lg5+1+2lg5=1+3lg5
lg2*lg2+lg50*lg2+lg25=lg2(lg2+lg50)+lg25=lg2(lg100)+lg25=2lg2+lg25=lg4+lg25=lg100=2
=lg22+lg2^2*lg5+lg25=lg22+2*lg2*lg5+lg25=(lg2+lg5)^2=(lg10)^2=1^2=1
(lg2)²+lg2lg50+lg25=(lg2)²+lg2×lg(5²×2)+lg5²=(lg2)²+lg2(2lg5+lg2)+2lg5=(lg2
(lg2)^2=lg2*lg2(lg2)^2+lg2*lg5+lg5(=lg2*lg2+lg2*lg5+lg5(前两项提取公因式lg2)=lg2(lg2+lg5)+lg5=lg2*1+lg5=1
令2^(-1)=x=0.5两边取对数:-lg2=lgx所以lg2
(lg2)^3+3lg2*lg5+(lg5)^3=(lg^32+lg^35)+3lg2*lg5=(lg2+lg5)(lg^22-lg2*lg5+lg^25)+3lg2*lg5=(lg^22-lg2*l
原式=lg(2)*lg(2.5)+lg(0.2)*lg(40)=lg(2)*lg(2.5)+lg(0.2)*〔lg(2)*lg(2)*lg(10)〕=lg(2)*lg(2.5)+lg(0.2)*〔2l
lg^2(5)+lg2+lg2乘lg5=lg^2(5)+lg2乘lg5+lg2=lg5*(lg5+lg2)+lg2=lg5*lg(5*2)+lg2=lg5*lg10+lg2=lg5*1+lg2=lg(
lg2+lg5=lg10=1log2(3)乘log3(2)=1lg2+lg5-log2(3)乘log3(2)=0
(lg5)^2+2lg2+(lg2)^2+log2(3)log3(4)=(lg5+lg2)^2+log2(4)=1+2=3
lg5+lg2*lg5+(lg2)^2=(lg2)^2+lg2lg5+lg5=lg2(lg2+lg5)+lg5=lg2*1+lg5=lg5+lg2=lg10=1
解题思路:对a分类讨论解题过程:varSWOC={};SWOC.tip=false;try{SWOCX2.OpenFile("http://dayi.prcedu.com/include/readq.