1) 1/2a + 1/3a - 1/4a если a= 1 5/7
2) 4/7b + 5/21b - 2/3b если b = 2 1/3
3) 1 5/12m + 2 7/18m - 1 2/9m если m=1 17/31
плиз со всеми решениями
плиз плиз плиз
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