Iknow this is easy but i'm really tired and my brain is dead rn lol. u need to put ×,÷,+,- in the order to make the statment true. ex. 3 2 4 1=9 = 3×2+4-1=9.sorry if this makes no sense lol

40. 3+2x4-1=10

39. 3+2x4+1=12

38. (3+2)x4+1=21

37. 2+3x4-1=13

Step-by-step explanation:

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b