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nikitakvantaliani
@nikitakvantaliani
August 2022
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упростите выражение
2/7(1,4a-3 целых 1/2b)-1,2(5/6a-0,5b)
N2 решите уравнение
0,6(x+7)-0,5(x-3)=6,8
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enoilsantas
Verified answer
2/7(1,4a - 3 1/2b) - 1,2(5/6a - 0,5b)
=
= 2/7 * 14/10а - 2/7 * 7/2b - 12/10 * 5/6a + 12/10 * 5/10b =
= 2/5a - b - a + 3/5b = -3/5a - 2/5b
№2
0,6(х + 7) - 0,5(х - 3) = 6,8
0,6х + 4,2 - 0,5х + 1,5 = 6,8
0,1х = 6,8 - 5,7
0,1х = 1,1
х = 11
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Answers & Comments
Verified answer
2/7(1,4a - 3 1/2b) - 1,2(5/6a - 0,5b) == 2/7 * 14/10а - 2/7 * 7/2b - 12/10 * 5/6a + 12/10 * 5/10b =
= 2/5a - b - a + 3/5b = -3/5a - 2/5b
№2
0,6(х + 7) - 0,5(х - 3) = 6,8
0,6х + 4,2 - 0,5х + 1,5 = 6,8
0,1х = 6,8 - 5,7
0,1х = 1,1
х = 11