1)В одном метре 100см
3м 15см =3,15 м
2м7см =2,7м
35см =0,35м
9см=0,09м
2)В одном кг 1000г
6кг350г=6,350кг
4кг83г=4,083кг
650г=0,650кг
49г=0,049кг
3)1$=100 центов
5$61цент =5,61$
17$35центов =17,35$
Sin 7π/3 = sin (2π + π/3) = sin π/3 = sqrt3/2
cos 7π/3 = cos (2π + π/3) = cos π/3 = 1/2
tg 7π/3 = tg (2•π + π/3) = tg π/3 = sqrt3
ctg 7π/3 = ctg (2•π + π/3) = ctg π/3 = sqrt3/3
(х+2,5х+1,5х)/3=6
5х=6*3
5х=18
х=18/5
х=3,6 третье
3,6*2,5=9 первое
3,6*1,5=5,4 второе
<span>7 3/4-(4 5/6- 3 1/2)+ 1 2/3 = 8 1/12
</span>1) 4 5/6 - 3 1/2 = 4 5/6 - 3 3/6 = 1 2/6 = 1 1/3
2) 7 3/4 - 1 1/3 = 7 9/12 - 1 4/12 = 6 5/12
3) 6 5/12 + 1 2/3 = 6 5/12 + 1 8/12 = 7 13/12 = 8 1/12
<span>9 2/5-(8 1/3 - 7 1/4 + 5 1/6) = 3,15
</span>1) 8 1/3 - 7 1/4 = 8 4/12 - 7 3/12 = 1 1/12
2) 1 1/12 + 5 1/6 = 1 1/12 + 5 2/12 = 6 3/12 = 6 1/4
3) 9 2/5 - 6 1/4 = 9 8/20 - 6 5/12 = 3 3/20 = 3,15
<span>(6 5/8- 1/2)- (5 3/4- 2 1/6) + (9 5/8 - 7 1/3) = 4 17/24
</span>1) 6 5/8 - 1/2 = 6 5/8 - 4/8 = 6 1/8
2) 5 3/4 - 2 1/6 = 5 9/12 - 2 2/12 = 3 7/12
3) 9 5/8 - 7 1/3 = 9 15/24 - 7 8/24 = 2 7/24
4) 6 1/8-3 7/12 = 6 3/24 - 3 17/24 = 5 27/24 - 3 17/24 = 2 10/24
5) 2 10/24 + 2 7 /24 = 4 17/24
<span><span>(5 1/30 - 2 3/5 - 2/15 + 6 ) - (7 - 6 11/12 + 1/4) = 7 29/30
</span>1) 5 1/30 - 2 3/5 = 5 1/30 - 2 18/30 = 4 31/30 - 2 18/30 = 2 13/30
2) 2 13/30 -2/15 = 2 13/30 - 4/30 = 2 9/30 = 2 3/10
3) 2 3/10 + 6 = 8 3/10
4) 7 - 6 11/12 = 6 12/12 - 6 11/12 = 1/12
5) 1/12+ 1/4 = 1/12 + 3/12 = 4/12 = 1/3
6) 8 3/10 - 1/3 = 8 9/30 - 10/30 = 7 39/30 - 10/30 = 7 29/30
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