D = 100 - 4*21 = 16
x1 = ( - 10 + 4)/2 = - 6/2 = - 3;
x2 = ( - 10 - 4)/2 = - 14/2 = - 7;
1:26000000
1) 3*26000000=78000000 (см.)
2) 78000000:100000=780 (км.)
(203,08-29.8):3.8+54,4 =173,28<span>:3.8+54,4 =45,6+54,4=100</span>
Х:16=3
х=3*16
х=48
57:х=3
х=57:3
х=19