Działania na liczbach całkowitych

 $\left(-7\right)\cdot\left(-4\right)=$  

 $\left(-5\right)+2=$  

 $\left(-8\right)-\left(-4\right)=$  

 $6-9=$  

 $42:\left(-7\right)=$  

 $\left(-6\right)+\left(-5\right)=$  

 $\left(-8\right)\cdot6=$  

 $4-\left(-5\right)=$  

 $\left(-15\right):\left(-3\right)=$  

 $8\cdot\left(-9\right)=$