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Автор - Polli200p

Упростите выражения/ квадрат суммы. квадрат разности
1. (2х - 1) - 2х (3х - 5)
2. 6у (у + 5) - (2у - 3)^2
3. 4 (х - 2у)^2 + 16ху

Ответ

Автор - anika66682
)))))))))))))))))))))))

Ответ

Автор - Golovolomka1111

(2x - 1) - 2x(3x - 5) = 2x - 1 - 6x - 10x =  - 14x - 1 \ 2)6y(y + 5) - (2y - 3 {)}^{2}  = 6 {y}^{2}  + 30y - ((2 {y}^{2})  - 2 times 2y times 3 +  {3}^{2} ) =  \ 6 {y}^{2}  + 30y -4 {y}^{2}   - 12y + 9 = 2 {y}^{2}  + 18y
3)4( x - 2y {)}^{2}  + 16xy = 4( {x}^{2}  - 2x times 2y + (2y {)}^{2} ) + 16xy =  \ 4( {x}^{2}  - 4xy + 4 {y}^{2} ) + 16xy = 4 {x}^{2}  - 16xy + 16 {y}^{2}  + 16xy =  \ 4 {x}^{2}  + 16 {y}^{2}

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