А: 1) 1/2 + x/3 =; 2) 2/5 + a/2 =; 3) y/7 − x/3 =; 4) 2/a + 1/3 =; 5) x/y + 2/3 =; 6) 5/a + 1/b =; 7) c/7 − 2/a =; 8) 8/b − a/c =; 9) ab/x − y/3 =; 10) 3x/a + 2y/b =.

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Accepted Answer

Приводим дроби к общему знаменателю, затем складываем или вычитаем числители.

1/2 + x/3 = 3/6 + 2x/6 = (2x + 3)/6.
2/5 + a/2 = 4/10 + 5a/10 = (5a + 4)/10.
y/7 − x/3 = 3y/21 − 7x/21 = (3y − 7x)/21.
2/a + 1/3 = 6/(3a) + a/(3a) = (a + 6)/(3a).
x/y + 2/3 = 3x/(3y) + 2y/(3y) = (3x + 2y)/(3y).
5/a + 1/b = 5b/(ab) + a/(ab) = (5b + a)/(ab).
c/7 − 2/a = ac/(7a) − 14/(7a) = (ac − 14)/(7a).
8/b − a/c = 8c/(bc) − ab/(bc) = (8c − ab)/(bc).
ab/x − y/3 = 3ab/(3x) − xy/(3x) = (3ab − xy)/(3x).
3x/a + 2y/b = 3bx/(ab) + 2ay/(ab) = (3bx + 2ay)/(ab).

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