(5х^2 - 3х - 2) / (5х^2 + 2х)=
Представим в числителе -3х в виде 2х-5х:
=(5х^2 + 2х - 5х -2) / (5х^2 + 2х)=
Теперь представим выражение в виде суммы двух дробей:
= (5х^2 + 2х) / (5х^2 + 2х) + (-5х-2) /(5х^2 + 2х)=
В первой дроби числитель и знаменатели равны и сокращаются так, что дробь равна 1, а в знаменателе второй дроби вынесем за скобку х, а в числителе -1:
= 1 - (5х+2)/[х(5х+2)] =
Сократим числитель и знаменатель на 5х+2:
= 1 - 1/х = (х-1)/х
(91-19):18=4
(82-28):18=3
(73-37):18=2
(64-46):18=1
Закономерность: идет уменьшение чисел в скобках на 9.
(12+21):11=3
(23+32):11=5
(34+43):11=7
(45+54):11=9
Закономерность: идет увеличение чисел в скобках на 11.
А) 5 000 000 метров квадратных б) 8 метров квадратных в) 900 метров квадратных
Two girls-artist, Sue Jones, rent a room, under the window which is a huge tree. One of the girls was seriously ill, she desperately does not want to fight, come up with myself that as soon as the last autumn leaf fall from the tree outside the window, she dies, and is quietly waiting for death. A sheet of all falls, falls, falls ... It turns out the last leaf has fallen for a long time, as it should have happened, and the neighbor-artist, Berman old, not very talented, but very good, painted the exact same sheet in the picture , cold and died. His first and last masterpiece rescued the girl, because she suddenly went on the mend
Смотрите решение на фото:
