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Miranda2008
@Miranda2008
July 2022
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Упростите выражения:а) 7+4с-5с+11с-с; б) 0,2(7р-6к)-0,3(3р-4к)-2(-2р+5к); в) 2/7(1,4а-3 целых 1/2b)-1,2(5/6а-0,5b)
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zhenyaM2002
Verified answer
7 + 4с - 5с +11с -с = 7 + 15с - 6с = 7 + 9с
0,2(7р -6к) - 0,3(3р - 4к) - 2 (-2р +5к) =
= 1,4р - 1,2к - 0,9р + 1,2к + 4р -10к =
=(1,4р - 0,9р + 4р) + (-1,2к +1,2к -10к) =
= 4,5р -10к
2/7*(1,4а - 3 1/2 *b ) - 1.2* (5/6 a -0.5b) =
= 2/7 * 7/5 * a + 2/7 * (-7/2) *b - 6/5 * 5/6 * a +0.6b =
= 2/5 * a - b - a +0.6b =
= (0.4a -a) + (-b +0.6b) =
=- 0.6a - 0.4b
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Answers & Comments
Verified answer
7 + 4с - 5с +11с -с = 7 + 15с - 6с = 7 + 9с0,2(7р -6к) - 0,3(3р - 4к) - 2 (-2р +5к) =
= 1,4р - 1,2к - 0,9р + 1,2к + 4р -10к =
=(1,4р - 0,9р + 4р) + (-1,2к +1,2к -10к) =
= 4,5р -10к
2/7*(1,4а - 3 1/2 *b ) - 1.2* (5/6 a -0.5b) =
= 2/7 * 7/5 * a + 2/7 * (-7/2) *b - 6/5 * 5/6 * a +0.6b =
= 2/5 * a - b - a +0.6b =
= (0.4a -a) + (-b +0.6b) =
=- 0.6a - 0.4b