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Пошаговое объяснение:

б)

[tex]-7\frac{1}{3} : 2,75+1\frac{2}{19} *(-19\frac{3}{14} -(-9,6):\frac{7}{15} )=-\frac{22}{3} :\frac{11}{4} +\frac{21}{19} *(-\frac{269}{14} +9,6*\frac{15}{7} )=-\frac{22}{3} *\frac{4}{11} +\frac{21}{19} *(-\frac{269}{14} +48*\frac{3}{7} )=-\frac{8}{3} +\frac{21}{19} *(-\frac{269}{14} +\frac{144}{7} )= -\frac{8}{3} +\frac{21}{19} *\frac{19}{14} =-\frac{8}{3} +3*\frac{1}{2} =-\frac{8}{3} +\frac{3}{2} =-\frac{7}{6}[/tex]

4)|2x-3,1|=4,2

2x-3,1=4,2

2x-3,1=-4,2

x=3,65

x=-0,55

5)

1)-6(x+11)=0

x+11=0

x=-11

2)(x-8)(x-23)=0

x-8=9

x-32=0

x=8

x=32

6)[tex]-0,015a*(-22\frac{2}{9} )2\frac{4}{7} b=-\frac{3}{200} a*(-\frac{200}{9} )*\frac{18}{7} b=3a*\frac{2}{7} b=\frac{6}{7} ab[/tex]

Пошаговое объяснение:

б

1) -9,6 : 7/15 = -96/10 * 15/7 = -96/2 * 3/7 = -288/14 = -20 8/14

2) -19 3/14 - (-20 8/14) = -19 3/14 + 20 8/14 = 1 5/14

3) 1 2/19 * 1 5/14 = 21/19 * 19/14 = 3/1 * 1/2 = 3/2 = 1 1/2

3) -7 1/3 : 2,75 = -22/3 : 275/100 = -22/3 * 100/275 = -2200/825 = -2 550/825 = -2 2/3

4) -2 2/3 + 1 1/2 = -2 4/6 + 1 3/6 = -1 1/6

№4

|2х - 3,1| = 4,2

1)

2х - 3,1 = -4,2

2х = -4,2 + 3,1

2х = -1,1

х = -1,1 : 2

х1 = -0,55

2)

2х - 3,1 = 4,2

2х = 4,2 + 3,1

2х = 7,3

х = 7,3 : 2

х2 = 3,65

№5

1)

-6(х + 11) = 0

-6х - 66 = 0

-6х = 66

х = 66 : (-6)

х = -11

2)

(х - 8)(х - 23) = 0

1)

х - 8 = 0

х1 = 8

2)

х - 23 = 0

х2 = 23