Вправи: 215

215. Знайдіть частку дробів:

1) x+13 : x+115 = x+13 • 15x+1 = x+1•153 •(x+1) = 5;

2) 5y-57 : y-128 = 5y-57 • 28y-1 = 5y-5•287 •(y-1) = 5y-1•287 •(y-1) = 20;

3) 2a+18 : 4a+216 = 2a+18 • 164a+2 = 2a+1•168 •(4a+2) = 2a+1•22(2a+1) = 1;

4) 1-b5 : (b-1)225 = 1-b5 • 25(b-1)2 = 1-b•255(b-1)2 = 1-b•5(1-b)2 = 51-b;

5) 3-6y14 : 2y-142 = 3-6y14 • 422y-1 = 3-6y•4214 •(2y-1) = 31-2y•4214 •(2y-1) = –9;

6) 1-3x18 : 9x-342 = 1-3x18 • 429x-3 = 1-3x•4218 •(9x-3) = –3x-1•79 •(3x-1) = –79;