Ответ:
Пошаговое объяснение:
6x + 12 = -7x + 25
6x + 7x = 25 - 12
13x = 13
x = 13 : 13
x = 1
x + 6(3 - 3x) = 35
x + 18 - 18x = 35
-17x = 35 - 18
-17x = 17
x = 17 : (-17)
x = -1
1/3x + 1 = -1/4(x + 4/5)
1/3x + 1 = -1/4x - 1/5
1/3x + 1/4x = -1/5 - 1
4/12x + 3/12x = -1 1/5
7/12x = -1 1/5
x = -1 1/5 : 7/12
x = -6/5 * 12/7
x = -72/35
x = -2 2/35
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a)
8x + x = 360
9x = 360
x = 360:9
x = 40
40*8=320 большее число
б)
7x - x = 360
6x = 360
x = 360 : 6
x = 60
60*7 = 420 большее число
в)
x + 6 + x = 56
2x + 6 = 56
2x = 56 - 6
2x = 50
x = 50 : 2
x = 25 стр прочитал вчера
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4x + 3*(x + 10) = 520
4x + 3x + 30 = 520
7x + 30 = 520
7x = 520 - 30
7x = 490
x = 490 : 7
x = 70км/ч скорость на первом участке