7 1/2 - ( 2,5 + 2 1/3 ) = 7 3/6 - 2 2/6 - 2,5 = 5 1/6 - 2 3/6 = 4 7/6 - 2 3/6 = 2 4/6 = 2 2/3
Номер 1
1) |x| = 53,
x = 53 = -53
2) |x| = 300,7,
x = 300,7 = -300,7
3) |x| = 19 7\17,
x = 19 7\17 = -19 7\17
Номер 2
1) |x| = 15 2\15 - 7 1\12 = 15 8\60 - 7 5\60 = 8 3\60 = 8 1\20,
x = 8 1\20 = -8 1\20
2) |x|= 6 2\3 + 21 9\10 = 6 20\30 + 21 27\30 = 28 17\30,
x = 28 17\30 = -28 17\30
3) |x| = 101 8\9 - 100 3\10 = 101 80\90 - 100 27\90 = 1 53\90,
x = 1 53\90 = -1 53\90
Номер 3
9,11,13
S : (u - v) + S : (u + v) = S/u - S/v + S/u + S/v = 2S/u
А) х:8=15/16
х=15/16*8/1
х=15/2
х=7 1/2=7,5
б)5/10:3=5/3:х
5/3:х=1/6
х=5/3:1/6
х=5/3*6/1
х=10
Х=4,5-7=-2,5
У=3,9-6=-2,1
n=7,4-5=2,4
k=9-10,2=-1,2
р=5 1/7-8=(36-56)/7=-20/7=2 6/7