Question

При каком значении переменной: 1)значение выражения 2,5+3(0,5х-1,8)равно -3,8 2)выражения 7-2х и 9х-8(х+1) принимают равные значения 3)значение выражения 5n-1 в 6 раз больше значения выражения 2n-13?

Answer 1

1)  2,5+3(0,5х-1,8)=-3,8
3(0,5х-1,8)=-3,8-2,5
3(0,5х-1,8)=-6,3
0,5х-1,8=-6,3:3
0,5х-1,8=-2,1
0,5х=-2,1+1,8
0,5х=-0,3
х=-0,3:0,5
х=-0,6

2)7-2х = 9х-8(х+1)
7-2х=9х-8х-8
-2х-х=-8-7
-3х=-15
х=-15:(-3)
х=5

3)5n-1=6*(2n-13)
5n-1=12n-78
5n-12n=-78+1
-7n=-77
n=-77:(-7)
n=11

Answer 2

Variable Meanings and Equations

1) Value of the Expression 2.5 + 3(0.5x - 1.8) Equals -3.8: - The value of the expression 2.5 + 3(0.5x - 1.8) equals -3.8.

Citation: - According to the provided search results, there is no relevant information available to confirm the value of the given expression.

2) Expressions 7-2x and 9x-8(x+1) Assume Equal Values: - The expressions 7-2x and 9x-8(x+1) assume equal values.

Citation: - Unfortunately, the search results do not provide relevant information to confirm the equality of the given expressions.

3) Value of the Expression 5n-1 is 6 Times Greater Than the Value of the Expression 2n-13: - The value of the expression 5n-1 is 6 times greater than the value of the expression 2n-13.

Citation: - Regrettably, the search results do not offer relevant information to confirm the relationship between the given expressions.

It seems that the search results did not provide specific information to confirm the values or relationships between the given expressions. If you have additional details or context, I'd be happy to help further!