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alinab2005
@alinab2005
July 2022
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ДАЮ 50 БАЛЛОВ!! ПОМОГИТЕ ПЖ!
x+2 x-3
------ = ------
9 2
Б) 5,6-3(2-0,4x)=0,4(4x+1)
Хотя бы один очень надо
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svetazuna
(х+2)/9 = (х-3)/2,
2*(х+2) = 9*(х-3),
2х + 4 = 9х - 27,
9х - 2х = 4 + 27,
7х = 31,
х = 31/7,
х = 4 3/7,
проверка:
(4 3/7 + 2) / 9 = (4 3/7 - 3) / 2,
(6 3/7)/9 = (1 3/7)/2,
45/7 : 9 = 10/7 : 2,
45/7 * 1/9 = 10/7 * 1/2,
45/63 = 10/14,
5/7 = 5/7,
5,6 - 3*(2 - 0,4х) = 0,4*(4х + 1),
5,6 - 6 + 1,2х = 1,6х + 0,4,
1,2х - 1,6х = 0,4 - 5,6 + 6,
-0,4х = 0,8,
х = -2,
проверка:
5,6 - 3*(2-0,4*(-2)) = 0,4*(4*(-2) + 1),
5,6 - 3*(2+0,8) = 0,4*(-8+1),
5,6 - 3*2,8 = 0,4*(-7),
5,6 - 8,4 = -2,8,
-2,8 = -2,8
1 votes
Thanks 1
alinab2005
спасибо огромное)) прям выручила:3
svetazuna
:))
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Answers & Comments
2*(х+2) = 9*(х-3),
2х + 4 = 9х - 27,
9х - 2х = 4 + 27,
7х = 31,
х = 31/7,
х = 4 3/7,
проверка:
(4 3/7 + 2) / 9 = (4 3/7 - 3) / 2,
(6 3/7)/9 = (1 3/7)/2,
45/7 : 9 = 10/7 : 2,
45/7 * 1/9 = 10/7 * 1/2,
45/63 = 10/14,
5/7 = 5/7,
5,6 - 3*(2 - 0,4х) = 0,4*(4х + 1),
5,6 - 6 + 1,2х = 1,6х + 0,4,
1,2х - 1,6х = 0,4 - 5,6 + 6,
-0,4х = 0,8,
х = -2,
проверка:
5,6 - 3*(2-0,4*(-2)) = 0,4*(4*(-2) + 1),
5,6 - 3*(2+0,8) = 0,4*(-8+1),
5,6 - 3*2,8 = 0,4*(-7),
5,6 - 8,4 = -2,8,
-2,8 = -2,8