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5y(2y³-4) = 5y *2y³ + 5y *(-4) = 10y⁴ - 20y
(c-6)(c+4) =c² +4c -6c - 24 = c² - 2c - 24
8x² - 9x(x+2) = 8x² - 9x² -18x = -x² - 18x
(2x+y)(x-7y) = 2x² - 14xy +xy -7y² =2x² - 13xy -7y²
(7x + 9) - (10x -2) = 17
7x + 9 -10x + 2 = 17
-3x + 11 = 17
-3x = 17 - 11
-3x = 6
x = 6 : (-3)
х = -2
-------------------------------------
(7 * (-2) + 9 ) - (10 * (-2) - 2) = 17
(-14 + 9) - ( - 20 - 2) = 17
- 5 - ( - 22) = 17
- 5 + 22 = 17
17 = 17
9 - 4(х - 3,5) = 11 - 8х
9 - 4х - 4*(-3,5) = 11 - 8х
9 - 4х + 14 = 11 - 8х
-4х + 23 = 11 - 8х
-4х + 8х = 11 - 23
4х = -12
х = -12 : 4
х = -3
---------------------------------------
9 - 4(-3 - 3,5) =11 - 8 *(-3)
9 - 4 * (-6,5) = 11 + 24
9 + 26 = 35
35 = 35
16а² - 4а =4а*4а - 4а*1 = 4а(4а-1)
5ху - х²у = ху( 5 -х)
(c-6)(c+4) =c² +4c -6c - 24 = c² - 2c - 24
8x² - 9x(x+2) = 8x² - 9x² -18x = -x² - 18x
(2x+y)(x-7y) = 2x² - 14xy +xy -7y² =2x² - 13xy -7y²
(7x + 9) - (10x -2) = 17
7x + 9 -10x + 2 = 17
-3x + 11 = 17
-3x = 17 - 11
-3x = 6
x = 6 : (-3)
х = -2
-------------------------------------
(7 * (-2) + 9 ) - (10 * (-2) - 2) = 17
(-14 + 9) - ( - 20 - 2) = 17
- 5 - ( - 22) = 17
- 5 + 22 = 17
17 = 17
9 - 4(х - 3,5) = 11 - 8х
9 - 4х - 4*(-3,5) = 11 - 8х
9 - 4х + 14 = 11 - 8х
-4х + 23 = 11 - 8х
-4х + 8х = 11 - 23
4х = -12
х = -12 : 4
х = -3
---------------------------------------
9 - 4(-3 - 3,5) =11 - 8 *(-3)
9 - 4 * (-6,5) = 11 + 24
9 + 26 = 35
35 = 35
16а² - 4а =4а*4а - 4а*1 = 4а(4а-1)
5ху - х²у = ху( 5 -х)
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