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2
Пошаговое объяснение:
Ищем закономерность:
2*2020 - на конце 0
3*2019 - на конце 7
4*2018 - на конце 2
5*2017 - на конце 5
6*2016 - на конце 6
7*2015 - на конце 5
8*2014 - на конце 2
9*2013 - на конце 7
10*2012 - на конце 0
11*2011 - на конце 1
... - начинает повторяться
12*2010 - на конце 0
13*2009 - на конце 7
и т. д.
Итак, у нас 10 цифр - 0, 7, 2, 5, 6, 5, 2, 7, 0, 1. Их сумма равна: 0+7+2+5+6+5+2+7+0+1=35.
2020-1011+1=1010 шт. - всего цифр
1010:10=101 раз - по 10 цифр
101*35=3535 ⇒ оканчивается на 5
7²⁰²¹ - на конце 7
5+7=12 ⇒ на конце 2
Пошаговое объяснение:
а) 5х + (Зх - 3) = 6x + 11
5x + 3x - 3 = 6x + 11
8x - 3 = 6x + 11
8x - 6x = 11 + 3
2x = 14
x = 14:2
x = 7
3x - (10+5x) = 54
3x - 10 - 5x = 54
-2x - 10 = 54
2x = -10 - 54
2x = -64
x = -64:2
x = -32
5(2x - 4) = 2(5x - 10)
10x - 20 = 10x - 20
10x - 10x = 20 - 20
0 = 0
x є (-∞ ; ∞)
уравнение имеет множество решений
0,6 + (0,5x - 1) = x + 0,5
0,6 + 0,5x - 1 = x + 0,5
-0,4 + 0,5x = x + 0,5
x - 0,5x = -0,4 - 0,5
0,5x = -0,9
x = -0,9 : 0,5
x = -1,8
4(x + 3,6) = 3x - 1,4
4x + 14,4 = 3x - 1,4
4x - 3x = -1,4 - 14,4
x = -15,8