Solve and fill the square

Solve and fill in the blanks

Solve and fill in the blanks

Let us fill up the blank squares- 20 -50 + square = -1

Let us fill up the blank squares- -15 -: (-5) - square = -1

Let us fill up the blank squares- square -: 4 - 2 = -7

Let us fill up the blank squares- -16 -: (-2) + square = -1

Let us fill up the blank squares- (-18) -: square + 3 = -6

7 xx {(-3)-(-6)} = 21 = 7 xx (-3) -7 xx (-6) = square-square=square=square=21 (Let's fill the blank squares.)

Let's fill in the blank squares given below:- 5^@=?