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alice8289
@alice8289
August 2022
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Помогите пожалуйста, 6 класс
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kseniavashkina
1. А) -24ху
Б)1,8nm
4.-3b
5.3y
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evvoronina1
1.
а) -2•(-4х)•(-3у) = -24ху
Коэффициент -24
б) 3,6•(-0,5n)•(-m) = 1,8mn
Коэффициент 1,8
в) -6/12 • (-2 1/6 • а) • (-3 1/2) =
= -6/12 • (-13/6 • a) • (-7/2) =
= -(6•13•6)•a/(12•6•2) = -13/4 • a = -3 1/4 • a
Коэффициент -3 целых 1/4
2.
а) 4(3-а) + (n-5)•(-3) = 12 - 4a - 3n + 15 =
= 27 - 4a - 3n
б) -1,4(1 3/7 - 2/7 • х) =
= -14/10 • (10/7 - 2/7 • х) =
= -14/10 • 10/7 + 14/10 • 2/7 • x =
= -2 + 4/10 • x = -2 + 0,4x = 0,4x - 2
4. 0,1b - 4b + 0,09b = 0,19b - 4b = -3,81b
5. 0,2y + 3y - 1/5 •y = 0,2y + 3y - 0,2y = 3y
14. -2•(-3,5x - 4,8) + 8x = 7x + 9,6 + 8x =
= 15x + 9,6
15. -17(x-y) + 3(x+y) = -17x + 17y + 3x + 3y =
= 20y - 14x
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Answers & Comments
1. А) -24ху
Б)1,8nm
4.-3b
5.3y
а) -2•(-4х)•(-3у) = -24ху
Коэффициент -24
б) 3,6•(-0,5n)•(-m) = 1,8mn
Коэффициент 1,8
в) -6/12 • (-2 1/6 • а) • (-3 1/2) =
= -6/12 • (-13/6 • a) • (-7/2) =
= -(6•13•6)•a/(12•6•2) = -13/4 • a = -3 1/4 • a
Коэффициент -3 целых 1/4
2.
а) 4(3-а) + (n-5)•(-3) = 12 - 4a - 3n + 15 =
= 27 - 4a - 3n
б) -1,4(1 3/7 - 2/7 • х) =
= -14/10 • (10/7 - 2/7 • х) =
= -14/10 • 10/7 + 14/10 • 2/7 • x =
= -2 + 4/10 • x = -2 + 0,4x = 0,4x - 2
4. 0,1b - 4b + 0,09b = 0,19b - 4b = -3,81b
5. 0,2y + 3y - 1/5 •y = 0,2y + 3y - 0,2y = 3y
14. -2•(-3,5x - 4,8) + 8x = 7x + 9,6 + 8x =
= 15x + 9,6
15. -17(x-y) + 3(x+y) = -17x + 17y + 3x + 3y =
= 20y - 14x