<h2>Решение (а):</h2>
Чтобы найти значение x, воспользуемся перекрестным умножением.
Что значит ,
= 2 × 30 = 5 × х
= 2 × 30 = 5x
= 60 = 5x
= х = 60 ÷ 5
= х = 12
Следовательно, 2/5 = 12/30.
<h2> Решение (б):</h2>
Чтобы найти значение x, воспользуемся перекрестным умножением.
Что значит ,
= 30 × 8 = 48 × х
= 30 × 8 = 48x
= 240 = 48x
= х = 240 ÷ 48
= х = 5
Следовательно, 5/8 = 30/48 .
Answer: option b.
Step-by-step explanation:
To solve this exercise you must keep on mind the identities shown below:
1)
2)
3)
Therefore, to rewrite you must substitute identities and simplify the expression, as following:
Therefore, as you can see, the answer is the option b.
Answer:
$20
Step-by-step explanation:
2=10
4=20
Solve both equations for y:
Set the expressions equal to each other:
So, for every nonzero number a the system of equations has
one solution.
Answer:
0-12
Step-by-step explanation: