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]
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
-6(х + 11) = 0
-6х - 66 = 0
-6х = 66
х = 66 : (-6)
х = -11
(х - 8)(х - 23) = 0
х - 8 = 0
х1 = 8
х - 23 = 0
х2 = 23
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Answers & Comments
Verified answer
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