Question

Как сложить два рациональных числа с плюсом и минусом

Answer 1

-7 + 10 = 3
Так же как и целые числа.

Answer 2

Из большего модуля вычитают меньший и перед полученным числом ставят знак того слагаемого, модуль которого больше.
Например:
$132+(-102)=132-102=30$

Answer 3

Adding Two Rational Numbers

To add two rational numbers, you can simply add their numerators and keep the common denominator. Here's how you can do it with an example:

Let's say you want to add a/b and c/d.

The sum would be: (a * d + b * c) / (b * d).

Subtracting Two Rational Numbers

To subtract two rational numbers, you can simply subtract their numerators and keep the common denominator. Here's how you can do it with an example:

Let's say you want to subtract a/b from c/d.

The difference would be: (a * d - b * c) / (b * d).

These formulas allow you to add and subtract rational numbers with ease.