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Ответ:

1)

18:(-6) = -(18:6) = -3

-8.4:(-4) = 8.4:4 = 2.1

-24:(-0.3) = 24:0.3 = 80

2)

-4.3х=14.62

х=14.62:(-4.3)

х= 34

б) (х+[tex]\frac{22}{25}[/tex])*[tex]\frac{1}{3}[/tex] = -7[tex]\frac{1}{3}[/tex]

[tex](x+\frac{22}{25}) = -7\frac{1}{3} : \frac{1}{3}[/tex]

[tex](x+\frac{22}{25}) = -7\frac{1}{3} * \frac{3}{1}\\(x+\frac{22}{25}) = -\frac{22}{3} * 3\\(x+\frac{22}{25}) = -22\\x = -22-\frac{22}{25}\\ x = -22(1+\frac{1}{25} )\\x = -22*\frac{26}{25} = -\frac{572}{25} = -22.88\\[/tex]

3)

14.22-25:(-6.8+4.3) = 14.22-25:(2.5) = 14.22-10 = 12.22

4)

[tex](-3.4-6.1)*1\frac{6}{19} +(1\frac{41}{42} -2\frac{5}{21} ):1\frac{4}{7} = \\(-9.5)*\frac{25}{19} + (\frac{83}{42} -\frac{47}{21} ):\frac{11}{7} =\\-\frac{*19*25}{2*19} + (\frac{83-94}{21})*\frac{7}{11} = -12.5+\frac{-11}{21} *\frac{7}{11} = -12.5-\frac{1}{3} = -\frac{75}{6} - \frac{2}{6} = -\frac{77}{6} = -12\frac{5}{6}[/tex]