The perimeter of a semicircle garden is 51.4 meters. 50% of the garden is planted with rose. What is the area of rose?

Let the radius of the semicircle be r, then 2 × 3.14r △ 2 + 2R = 51.4
R = 10m
Therefore, the area of rose is 3.14 × 10 & # 178; △ 2 △ 2 = 78.5 square meters

The total area of a flower garden is 320 square meters. Plan 3: 5 is to plant roses and roses respectively. How much less is the area of roses than roses

The area of each piece is: 320 (3 + 5) = 40 (M2)
Less rose species: 40 × (5-3) = 80 (M2)

Factorization factor 3x ^ 2y-12xy ^ 2 + 12Y ^ 3

3x^2y-12xy^2+12y^3
=3y(x²-4xy+4y²)
=3y(x-2y)²

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