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1
а)
![a)(a - b)(2a - 3b) = 2 {a}^{2} - 3ab - 2ab + 3 {b}^{2} = 2 {a}^{2} + 3 {b }^{2} - 5ab a)(a - b)(2a - 3b) = 2 {a}^{2} - 3ab - 2ab + 3 {b}^{2} = 2 {a}^{2} + 3 {b }^{2} - 5ab](https://tex.z-dn.net/?f=a%29%28a+-+b%29%282a+-+3b%29+%3D+2+%7Ba%7D%5E%7B2%7D++-+3ab+-+2ab+%2B+3+%7Bb%7D%5E%7B2%7D++%3D+2+%7Ba%7D%5E%7B2%7D++%2B+3+%7Bb+%7D%5E%7B2%7D++-+5ab)
б)
![(3ab - 1)(2a - b + 3) = 6 {a}^{2} b - 3a {b}^{2} + 9ab - 2a - b - 3 (3ab - 1)(2a - b + 3) = 6 {a}^{2} b - 3a {b}^{2} + 9ab - 2a - b - 3](https://tex.z-dn.net/?f=%283ab+-+1%29%282a+-+b+%2B+3%29+%3D+6+%7Ba%7D%5E%7B2%7D+b+-+3a+%7Bb%7D%5E%7B2%7D++%2B+9ab+-+2a+-+b+-+3+)
#2
![4 {x}^{2} - (2 + 1)(2x - 2) = 40 \\ 4 {x}^{2} - (4x - 4 + 2x - 2) = 40 \\ 4 {x}^{2} - 4x + 4 - 2x + 2 - 40 = 0 \\ 4 {x}^{2} - 6x - 34 = 0 4 {x}^{2} - (2 + 1)(2x - 2) = 40 \\ 4 {x}^{2} - (4x - 4 + 2x - 2) = 40 \\ 4 {x}^{2} - 4x + 4 - 2x + 2 - 40 = 0 \\ 4 {x}^{2} - 6x - 34 = 0](https://tex.z-dn.net/?f=4+%7Bx%7D%5E%7B2%7D++-+%282+++%2B+1%29%282x+-+2%29+%3D+40+%5C%5C+4+%7Bx%7D%5E%7B2%7D++-+%284x+-+4+%2B+2x+-+2%29+%3D+40+%5C%5C+4+%7Bx%7D%5E%7B2%7D++-+4x+%2B+4+-+2x+%2B+2+-+40+%3D+0+%5C%5C+4+%7Bx%7D%5E%7B2%7D++-+6x+-+34+%3D+0+)
б)
#2
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