Вычислите:а)5 3/4+3 5/7*1 1/4; б)15 3/8*4 1/6-4 1/6*15 3/8 в)((3 1/3+5 7/9)*2 1/4-1 1/15(3 5/6-7/12+9 7/8))*16/39
г)(20 8/15*7 1/2-54 3/5*2/5):(3 13/21*8 2/8-29 2/5)-5/6*1 1/5+21/25.

Пожалуйста помогите!!!
Заранее спасибо
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