lg5的平方+2/3lg8+lg5乘以lg20+(lg2)的平方=?紧急!
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lg5的平方+2/3lg8+lg5乘以lg20+(lg2)的平方=?紧急!
lg5的平方+2/3lg8+lg5乘以lg20+(lg2)的平方=?
紧急!
lg5的平方+2/3lg8+lg5乘以lg20+(lg2)的平方=?紧急!
lg5的平方+2/3lg8+lg5乘以lg20+(lg2)的平方
=lg5²+2/3lg8+lg5×lg20+(lg2)²
=2lg5+2/3lg2³+lg5×lg(4×5)+(lg2)²
=2lg5+(2/3)×3lg2+lg5×(lg4+lg5)+(lg2)²
=2(lg5+lg2)+lg5×lg2²+(lg5)²+(lg2)²
=2lg(5×2)+2lg5×lg2+(lg5)²+(lg2)²
=2lg10+(lg5+lg2)²
=2+[lg(5×2)]²
=2+(lg10)²
=2+1²
=3