=(x -9y)/(x -3y)(x +3y) + 3y/x(x -3y) =
=(x(x -9y) +3y(x +3y)) /x(x -3y)(x +3y) =
=(x² -9xy +3xy +9y²) /x(x -3y)(x +3y) =
=(x² -6xy +9y²) /x(x -3y)(x +3y) =
=(x -3y)² /x(x -3y)(x +3y) =
=(x -3y) /x(x +3y)
10аb+(-5а+b)²=10аb+(b-5а)²=<span>10аb+b</span>²-2ab+a² =8ab+a²+b²
a=√10 b=√5
8*√10*√5+(√10)²+(√5)²=8√50+10+5=8*5√2+15=40√2+15
4450 млн км=4450*1000000 км=4450*10⁶=4,450*10³*10⁶ км =4,450*10⁹ км
(-251+(0,37+(-0.2+(-0,152))=0,119-0.352=-0.233