А) 50 (3/50 + 7/25 = 17/50)
б) 200 (7/200 + 11/40 = 27/200)
в) 34 (8/17 + 9/34 = 25/34)
?? г) 600 (3/40 + 7/25 = 213/600)
180/20=18/2=9
1800/200=18/2=9
450/50=45/5=9
4500/500=45/5=9
400000-702•50/100=400000-702/2=400000-351=399649
190•200+(32148-16)=190•200+32132=38000+32132=70132
20-5=20 20*0=0 0=0 вот так
1/cos^2 a = tg^2a prosto podstav' I vce
X= 8 7/9 - 3 5/6
X= 7 16/9 - 3 5/6
X= 4 17/18