$55\cdot16-55\cdot6=$  

(a)  

 $10\cdot\left(-3+4\right)=$  

(a)  

 $-3-2-1+1+2+3=$  

(a)  

 $\left(-10\right)\cdot\left(-9\right)\cdot\left(-8\right)\cdot...\cdot8\cdot9\cdot10=$  

(a)  

 $25\cdot20=$  

(a)  

 $25\cdot24=$  

(a)  

 $-6+8-6+8+4-8=$  

(a)  

 $13\cdot5+13\cdot15=$  

(a)  

 $64\cdot2=$  

(a)  

 $-12:3+15:5=$  

(a)  

 $88:\left(-44\right)=$  

(a)  

 $12,4:124=$  

(a)  

 $\frac{5,5}{55}=$  

(a)  

 $-18:\left(-1,8\right)=$  

(a)  

300:25=

(a)  

 $-600:\left(-20\right)=$  

(a)  

200:(-400)=

(a)  

 $\frac{600}{12}=$  

(a)  

 $5+100:\left(-20\right)=$  

(a)