Question

19.43 + (-20).43 – (-40)

Answer 1

\(=43.\left(19-20\right)+40\\ =43.\left(-1\right)+40\\ =-43+40\\ =-3\)

Answer 2

\(19\cdot43+\left(-20\right)\cdot43-\left(-40\right)=817+\left(-860\right)-\left(-40\right)=\left(-43\right)-\left(40\right)=-3\)

Answer 3

\(19.43+\left(-20\right).43-\left(-40\right)=19.43-20.43+40=43\left(19-20\right)+40=43.\left(-1\right)+40=-3\)