Question

Прошу помогите,не успеваю

Answer 1

1) Е

$4520000=4,52*10^{6}$

2)

$(\frac{x^{-5}}{3y^{-4}} )^{-2}*8x^{8}y^{3}=\frac{x^{10}}{3^{-2}y^{8}} *8x^{8}y^{3}=\frac{9x^{10}}{y^{8}} *8x^{8}y^{3}=\frac{72x^{18}y^{3}}{y^{8}} =\frac{72x^{18}}{y^{5}}$

3)

$\frac{3^{0}*9^{-7}}{27^{-6}*3^{1}} =\frac{3^{0}*(3^{2})^{-7}}{(3^{3})^{-6}*3^{1}} =\frac{3^{0}*3^{-14}}{3^{-18}*3^{1}} =\frac{3^{-14}}{3^{-17}} =\frac{3^{17}}{3^{14}} =3^{3}=27$

4)

$2.7x^{2}y^{3}z^{5}*(-1\frac{5}{9} )*yz^{2}m=2.7x^{2}y^{4}z^{7}m*(-\frac{14}{9} )=-\frac{27}{10} *\frac{14}{9} *x^{2}y^{4}z^{7}m=\\\\=-4.2x^{2}y^{4}z^{7}m$

Коэффициент = -4,2

5)

$A=4y^{2}-3y\\\\B=9y^{2}-7y\\\\A-B=4y^{2}-3y-9y^{2}+7y=-5y^{2}+4y$

6)

$(4y-3)(2y-7)=8y^{2}-28y-6y+21=8y^{2}-34y+21$