Question

(x-80)×40=640 и объясните что означает 40x а то все пишут почему-то 40x-3200

Answer 1

Ответ:

(х-80)*40=640

умножаешь каждое в скобке на 40, получается:

х*40=40х

-80*40=-3200

40х-3200=640

40х=3840

х=3840/40

х=96

Понятно, почему получается "40х"?

Answer 2

To solve the equation (x - 80) × 40 = 640, let's follow the steps:

Step 1: Distribute the 40 on the left side of the equation:

40 * x - 40 * 80 = 640

Step 2: Simplify the equation:

40x - 3200 = 640

Now, let's explain what 40x means and why it is written as 40x - 3200 by some:

In the original equation (x - 80) × 40 = 640, the term 40x represents the result of multiplying 40 by x, which is a variable. This means we have 40 times an unknown value x.

When solving the equation, you need to follow the order of operations, which is also known as the distributive property. The distributive property allows us to multiply the 40 by each term inside the parentheses (x and -80):

40 * x = 40x 40 * (-80) = -3200

So, the correct way to simplify the equation is to distribute the 40, which results in:

40x - 3200 = 640

Therefore, both versions of the equation are equivalent, but the second one is simplified and easier to solve for x. It is possible that some people simply skip the steps and write 40x - 3200 directly as the simplified form.