Помогите, Пожалуйста, срочно!!!

1)Сократите дробь : 15a^8c/20a^4b^5c^5

2) сократите дробь : 3a-12b/4a^2-64b^2

3) сократите дробь : 6^n+3 -6^n+1/ 6^n+2- 6^n+1 -20*6^n

4) упростите : 5y^9 - 5y^7/y^8-2y^7+y^6
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