lg25+(2/3)lg8+lg5.lg20+(lg2)^2
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![lg25+(2/3)lg8+lg5.lg20+(lg2)^2](/uploads/image/z/2808052-52-2.jpg?t=lg25%2B%282%2F3%29lg8%2Blg5.lg20%2B%28lg2%29%5E2)
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lg25+(2/3)lg8+lg5.lg20+(lg2)^2
lg25+(2/3)lg8+lg5.lg20+(lg2)^2
lg25+(2/3)lg8+lg5.lg20+(lg2)^2
lg25+(2/3)lg8+lg5.lg20+(lg2)^2
=2lg5+2lg2+lg5(1+lg2)+(lg2)²
=2+lg5+lg5lg2+lg²2
=2+lg5+lg2
=2+1
=3