1. -4*7=-28
2. 27:(-9)=-3
3. -28-3=-31
В1 = ( 1 + 2 ) / 4 = 3 / 4 = 0,75
В2 = ( 2 + 2 ) / 4 = 4 / 4 = 1
В3 = ( 3 + 2 ) / 4 = 5 / 4 = 1,25
В1 • В2 • В3 = 0,75 • 1 • 1,25 = 0,9375
7/18x+0.3x+112=x
7/18x+3/10x+112=x
35/90x+27/90x+112=x
62/90x-x=-112
28/90x=112
28x=112*90
28x=10080
<em><u>x=360</u></em>
4000/(730+270)/2=2; 2000/(567+433)/2=1; (348+652)*5/500=10; 2999+1=3000; 27000-1=26999; 67799+1=67800