42:1 1/3 - 15,6 + 1 2/3 = 17 17/30
1) 42:1 1/3 = 42:4/3 = 42·3:4 = 31,5
2) 31,5 - 15,6 = 15,9
3) 15,9 + 1 2/3 = 159/10 + 5/3 = (159·3 + 5·10)/30 = 527/30 = 17 17/30
Z-(1,2-0,2z)+0,2=z-1,2+0,2z+0,2=1,2z+1
3n-(12-(5+4n))=3n-(12-5-4n)=3n-12+5+4n=7n-7
n=1
7·1-7=0
1) ∫x²dx = x³/3 + C
1 = 2³/3 + C
C = 1 - 8/3 = - 5/3
2) ∫40dx = = 40x + C
2 = 40×5 + C
C = 2 - 200 = -198
3) ∫sin(x)dx = - cos(x) + C
-1 = -cos(π) + C
C = cos(π) - 1 = -1 - 1 = -2
12,4*11,7+12,4*8,3=145,08+102,92=248
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5(х+3)=3(х-4)
5х+15=3х-12
5х-3х=-12-15
2х=-27
х=-13,5