выполните действия над дробями
1) 27c^25d:(-18c^3d^2);
2)14a^2/9x^3:7a/4x^2;
3) 7x^2 /10a^3:x/15a^5;
4)27a^3*a^2/b^2:18a^5/7b^3.
можно побыстрее 20 балов)))
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