Question

1.5,8+х=2,61 2.- 6,4+(-7,8)-(-6,5)-1,7

Answer 1

$5.8 + x = 2.61 \\ x = 2.61 - 5.8 \\ x = - 3.19 \\ \\ - 6.4 + ( - 7.8) - ( - 6.5) - 1.7 = - 6.4 - 7.8 + 6.5 - 1.7 = - 9.4$

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Answer 2

Let's solve the two equations step-by-step:

1. 1.5 + 8 + x = 2.61

To solve for x, we need to isolate x on one side of the equation. We can do this by moving the constants to the other side and combining like terms.

Step 1: Move the constants to the right side: x = 2.61 - (1.5 + 8)

Step 2: Simplify the right side: x = 2.61 - 9.5

Step 3: Calculate the result: x = -6.89

So the value of x in the first equation is -6.89.

2. -6.4 + (-7.8) - (-6.5) - 1.7

To solve this expression, we need to perform the operations in the correct order (following the rules of arithmetic).

Step 1: Simplify the parentheses first: -6.4 + (-7.8) + 6.5 - 1.7

Step 2: Combine the terms with the same sign: (-6.4 + 6.5) + (-7.8 - 1.7)

Step 3: Calculate the values inside the parentheses: 0.1 - 9.5

Step 4: Combine the remaining terms: -9.4

The result of the second expression is -9.4.

So, the solutions are:

1. x = -6.89
2. -6.4 + (-7.8) - (-6.5) - 1.7 = -9.4