Question

10. Reasoning Find the value of 12 +9+3+82-3³. Then change twooperation signs so that the value of the expression is-22.

Answer 1

We are given the following operation:

$12+9\div3+8^2-3^3$

First, we will solve the exponents:

$12+9\div3+8^2-3^3=12+9\div3+64-27$

Now, we solve the division:

$12+9\div3+64-27=12+3+64-27$

Now, we solve the addition and subtraction:

$12+3+64-27=52$

Therefore, the result of the operation is 52.

Now, we will change the last plus sing for a minus sign and the last minus sign for a plus sign:

$12+9\div3-8^2+3^3$

Now, we solve the exponents:

$12+9\div3-64+27$

Now, we solve the division:

$12+3-64+27$

Solving the addition and subtraction we get:

$-22$

And thus we have solved the operation with a final result of -22.