Question

Помогите пожалуйста решить

Answer 1

$1)4 {x}^{2} {y}^{5} times 10 {x}^{2} {y}^{4} times 2 {x}^{7} {y}^{2} = \ 80 {x}^{11} {y}^{11}$

$2) {a}^{3} { b }^{5} times 5 {a}^{6} {b}^{3} times 4 {ab}^{2} = \ 20 {a}^{10} {b}^{10}$

$3)( frac{2}{5} + frac{1}{2} ) div ( - frac{1}{5} ) + 4.5 =0 \ 1) frac{2}{5} + frac{1}{2} = frac{2 times 2}{10} + frac{5 times 1}{2} =$

$= frac{4}{10} + frac{5}{10} = frac{9}{10} \ 2) frac{9}{10} div ( - frac{1}{5} ) = - frac{9}{10} times frac{5}{1} = - frac{9}{2} =$

$= - 4.5 \ 3) - 4.5 + 4.5 = 0$

$4)2 {a}^{2} {b}^{7} times 25 {a}^{6} {b}^{3} times 4 {a}^{2} = \ 200 {a}^{10} {b}^{10}$

$5)( - frac{4}{5} - frac{7}{10} ) div frac{1}{2} + 3 = 0 \ 1) - frac{4}{5}-frac{7}{10} = - frac{8}{10}-frac{7}{10} = - frac{15}{10}$

$2) - frac{ 15}{10} div frac{1}{2} = - frac{15}{10} times frac{2}{1} = - frac{15}{5} = \ = - 3 \ 3) - 3 + 3 = 0$

$6)5ab times {a}^{2} times 14 {a}^{2} {b}^{4} =70 {a}^{5} {b}^{5}$

$7)( frac{1}{2} - frac{7}{8} ) div frac{1}{4} + 2 = 0.5\ 1) frac{1}{2} - frac{7}{8} = frac{4}{8} - frac{7}{8} = - frac{3}{8}$

$2) - frac{3}{8} div frac{1}{4} = - frac{3}{8} times frac{4}{1} = \ = - frac{3}{2} = - 1.5$

$3) - 1.5 + 2 = 0.5$