Вправи: 101

101. Виконайте додавання або віднімання дробів:

1) 9-5b\cb – 7-5c\bc = c9-5b- b(7 -5c)bc = 9c-5bc-7b+5bcbc = 9c-7bbc;

2) 4d+7\6 7d – d-6\7 6d = 64d+7-7(d-6)42d = 24d+42-7d+4242d = 17d+8442d;

3) 5-k\k 5p – p+ 10\p5k = k5- p- p(p+10)5pk = 5k-k2-p2-10p 5pk;

4) m-n\n mn – p-n\m np = nm-n2-mp+ mn mnp = 2mn- n2- mpmnp;

5) 6a+2\a ab – 2a+4\1 a2b = a6a+2-(2a+4)a2b = 6a2+2a-2a-4a2b = 6a2-4a2b;

6) c2-16c6 – c-9\c c5 = c2-16- c(c-9) c6 = c2-16-c2+9c c6 = 9c-16c6;

7) 1\x2x3 – 1+x2 x5 = x2-(1+x2) x5 = x2-1-x2 x5 = 1x5;

8) 1- ab\dabc + 1- ad\bacd = d1-ab- b(1- ad)abcd = d- abd- b+ abdabcd = d- babcd.