65 + (53 - 21) = 65 + 32 = 97
(500 + 100) - 200 = 600 - 200 = 400
(65 - 21) + (24 + 2) = 44 + 26 = 70
1 000 - (600 - 100) = 1 000 - 500 = 500
(16 + 12) + 40 = 28 + 40 = 68
1) v=10*16/8=20 м/с
<span>2) 9сек=0,0025час L=(56+84)*0,025=3,5км</span>
936 = 2 * 2 * 2 * 3 * 3 * 13 * 1
1404 = 2 * 2 * 3 * 3 * 3 * 13 * 1
НОД (936 и 1404) = 2 * 2 * 3 * 3 * 13 * 1 = 468
НОК (936 и 1404) = 2 * 2 * 2 * 3 * 3 * 3 * 13 * 1 = 2808
A)2( x+5)-(x+25)=0
2x+10-×+25=0
x=-35
735/50=14,7
1) 14,7*25=367,5
2) (0,420*1000)/14,7=28,57...