Question

А) -(2,8-1,4)+2,5 б) b+(-b-5,2)

Answer 1

A) -1,4+2,5=1,1
б)b-b-5,2
если b равно чему-то (например 3) тогда 3-3-5,2=-5,2

Answer 2

Let's solve each expression step by step:

а) -(2.8 - 1.4) + 2.5

Step 1: Simplify the expression within the parentheses: 2.8 - 1.4 = 1.4

Step 2: Negate the result of the simplified expression: -(1.4) = -1.4

Step 3: Add 2.5 to the negated result: -1.4 + 2.5 = 1.1

So, the value of the expression is 1.1.

b) b + (-b - 5.2)

Step 1: Simplify the expression within the parentheses: -b - 5.2

Step 2: Combine the like terms (terms with 'b'): b + (-b) = 0 (because a number added to its negation is always zero)

Step 3: Add 0 to -5.2: 0 + (-5.2) = -5.2

So, the value of the expression is -5.2.

In summary: a) -(2.8 - 1.4) + 2.5 = 1.1 b) b + (-b - 5.2) = -5.2