Question

помоготе пожалуйста 4 номер

Answer 1

=32,4*(6,7-1,7) +17,6*(8,3-3,3)=32,4*5 +17,6*5= 5(32,4+17,6)= 5*50=250

Answer 2

$3x {}^{2} - 21x - 4x - 3x {}^{2} = 5 \\ - 25x = 5 \\ x = - \frac{1}{5} \\ x = - 0.2 \:$