15-109+24-126 +1000:2

To solve this expression, we follow the order of operations (also known as PEMDAS).

First, we perform the division: 1000 divided by 2 equals 500.

Next, we perform the addition and subtraction from left to right:

15 - 109 equals -94. -94 + 24 equals -70. -70 - 126 equals -196.

Finally, we add the previous result to the result of the division:

-196 + 500 equals 304.

Therefore, the value of the expression 15-109+24-126 +1000:2 is 304.