Works on a free theme From grandfather I was given a love of gardening. It is very interesting to learn the subtleties and secrets of growing this or that fruit tree, it is interesting to cut a vine grape, and then watch how it is poured. Also, my grandfather teaches me how to properly vaccinate the desired varieties of fruit trees, and cut the bushes of currants and raspberries, tells me how to plant apple trees, pears, how much distance to observe between trees, what size should be the landing pits and lots of useful information. Also, my grandfather draws my attention to the time when it is necessary to carry out certain manipulations with plants, and when it is better to refuse any interventions. Insofar as our memory has the ability to forget some of the information, I began to write down useful information on each breed of fruit trees and bushes. In the future I want to have a big and bright private house, around which I plant a lot of trees. And I will have such a corner of my earthly paradise.
В решении.
Пошаговое объяснение:
Решить уравнение:
5/12 + (х - 3/20) = 1 и 4/15
Раскрыть скобки:
5/12 + х - 3/20 = 1 и 4/15
Неизвестное х влево, известное вправо:
х = 1 и 4/15 + 3/20 - 5/12
Перевести смешанное число в неправильную дробь:
х = 19/15 + 3/20 - 5/12
Общий знаменатель 60, пишем над числителями дополнительные множители:
х = (4*19 + 3*3 - 5*5)/60
х = (76 + 9 - 25)/60
х = 60/60
х = 1.
Проверка путём подстановки вычисленного значения х в уравнение показала, что данное решение удовлетворяет данному уравнению.