wykonaj mnożenia:
a) [(4x²-9)/ (x+1½)] * [5x/(3-2x)]
b) [(x²+2x)/ [(36-9x²)] * [(2x-4)/ x²]
/ jest to kreska ułamkowa
a)
4x²-9 5x (2x - 3)(2x + 3) 5x 2(x + 3/2) 5x 2 * 5x
------- * --------- = ------------------- * -------------- = ------------ * ------ = ------- = -10x
x+1½ 3 - 2x x + 3/2 -(2x - 3) x + 3/2 (-1) (-1)b)
x² + 2x 2x-4 x(x + 2) 2x - 4 x + 2 2(x - 2)
--------- * --------- = ------------------- * -------- = --------------------------- * -------------- =
36-9x² x² (6 - 3x)(6 +3x) x * x 3(x + 2) * (-3)(x - 2) x
1 * 2 2
------------- = -------
3 * (-3) * x -9x
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a)
4x²-9 5x (2x - 3)(2x + 3) 5x 2(x + 3/2) 5x 2 * 5x
------- * --------- = ------------------- * -------------- = ------------ * ------ = ------- = -10x
x+1½ 3 - 2x x + 3/2 -(2x - 3) x + 3/2 (-1) (-1)
b)
x² + 2x 2x-4 x(x + 2) 2x - 4 x + 2 2(x - 2)
--------- * --------- = ------------------- * -------- = --------------------------- * -------------- =
36-9x² x² (6 - 3x)(6 +3x) x * x 3(x + 2) * (-3)(x - 2) x
1 * 2 2
------------- = -------
3 * (-3) * x -9x