помогите пожалуйста!!!!!
*-умножение, /-дробь, :-делить, ^{}-степень.
1)3х*у/12х;
2)3ab/4xy*10x^{2}y/21a^{2}b;
3)5x:15x/y;
4) 12ab/25c:8a^{2}.
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