Question

3/7(49+2.1х)-(2х-5) при х=-10

Answer 1

3/7(49+2.1х)-(2х-5) при х=-10

3/7(49+2.1х)-(2х-5)=3/7*49+3/7*2,1х-2х+5=21+0,9х-2х+5=-1,1х+26

при х=-10

-1,1*(-10)+26=11+26=377

Ответ: 37

Answer 2

To evaluate the expression 3/7(49+2.1x) - (2x-5) when x = -10, we substitute the value of x into the expression and perform the necessary calculations.

First, let's substitute x = -10 into the expression:

3/7(49 + 2.1(-10)) - (2(-10) - 5)

Now, let's simplify the expression step by step:

3/7(49 + (-21)) - (-20 - 5) 3/7(49 - 21) - (-25) 3/7(28) + 25 84/7 + 25 12 + 25 37

Therefore, when x = -10, the expression 3/7(49 + 2.1x) - (2x-5) evaluates to 37.