1) 16 - с³ = 16 - 2³=16 - 8 = 8;
2) х³ - х² =х²·(х - 1) = 10²· (10 - 1) = 100·9 = 900;
3) 15а² = 15·4² = 15·16=240;
4) 4a²b³ = 4·6²·10³ = 144000;
5) (х² - у²) : (х - у) = (х - у)(х + у) : (х - у) = (х + у)=4 - 2 = 2;
6) (х² - у²) : х - у = (4² - 2²) : 4 - 2=(16-4) : 4 - 2 = 12 : 4 - 2 = 3 - 2 = 1
7) х²-у² : (х-у)= 4² - 2² :(4 - 2)=16 - 4:2 = 16 - 2 = 14
8) х²-у² : х-у = 4² - 2² :4 - 2=16 - 4:4 - 2 =16-1 -2=13