упростите выражение
15b + 8b * 7b+21
3-b b^2-9 4
15 8 * b 7 * b + 21 15 2 * b * 7 * (b + 3) 15 14 * b
------- + --------- * ------------- = -------- + ---------------------- = ------- + --------- =
3 - b b² - 9 4 3 - b (b - 3) * (b + 3) 3 - b b - 3
14 * b - 15
= ---------------
b - 3
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15 8 * b 7 * b + 21 15 2 * b * 7 * (b + 3) 15 14 * b
------- + --------- * ------------- = -------- + ---------------------- = ------- + --------- =
3 - b b² - 9 4 3 - b (b - 3) * (b + 3) 3 - b b - 3
14 * b - 15
= ---------------
b - 3