Автор - 15618

а)(5/8-2/5)+3/20;
б)1/8+(5/9-1/4);

Ответ

Автор - madina980917
1)5/8-2/5=25-16=9/40
2)9/40+3/20=9+6=15/20=3/4


2)5/9-1/4=20-9=11/36
3)1/8+11/36=9+22=31/72

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