求值:(lg2)2=(lg5)2=lg2*lg25=
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求值:(lg2)2=(lg5)2=lg2*lg25=
括号外的2为平方,*为乘号
括号外的2为平方,*为乘号
![求值:(lg2)2=(lg5)2=lg2*lg25=](/uploads/image/z/3041031-39-1.jpg?t=%E6%B1%82%E5%80%BC%3A%28lg2%292%3D%28lg5%292%3Dlg2%2Alg25%3D)
(lg2)2+(lg5)2+lg2*lg25
=lg2)2+(lg5)2+2lg2*lg5
=(lg2+lg5)^2
=lg10^2
=1
=lg2)2+(lg5)2+2lg2*lg5
=(lg2+lg5)^2
=lg10^2
=1