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Add, Subtract, Multiply And Divide Real Numbers

What is the value of (1.2)×(5)(-1.2)\times(-5) ?


What is the value of 719-7-19 ?


What is the value of  20(3)20-(-3) ?


What is the value of 9+(15)9+(-15) ?


What is the value of 3(5)-3-(-5) ?


What is the value of (−27) × (−6)?


What is the value of 20÷(4)20\div(-4) ?


What is the value of (15)÷(3)(-15)\div(-3) ?


What is the value of 243924-39 ?


What is the value of (16+26)(-16+26) ?