Pace Work. Math. Form 9D

Дата: 23.03.2020
Тема: Пропорції
Зміст уроку: розв'язування прикладів та тренувальні вправи

1. Study the theory block

In proportion we have two equal ratios. The equality is expressed by the sign:: which may be substituted by the international sign of equality =.
a: b:: c: d or a: b = c: d – is read: a is to b as c is to d;
2: 3:: 4: 6 or 2: 3 = 4: 6 – is read: two is to three as four is to six.
The extreme terms of proportion are called “extremes”, the mean terms are called “means”. The proportion can vary directly (змінюється прямо або пропорційно) and it can vary inversely (змінюється зворотньо пропорційно):
x (y: x varies directly as y; x is directly proportional to y;
x = k/y: x varies inversely as y; x is inversely proportional to y.


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