105. 1) 12* - 60;
2) 33y = 132;
8) 512 - 357;
4) 2x - 15 = 13;
5) 7y - 25 - 45;
6) 130 - 4x - 70;
7) 49 - 3x - 34:
8) 9y - 89 - 55;
9) 74 - 82 - 2.
Ответы
Ответ:
На первом ты написал " * " и я заменил её " x " чтобы понятней было
1) 12x - 60 = 0
12x = 60
x = 60 : 12
x = 5
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2) 33y = 132
y = 132 : 33
y = 4
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3) 512 - 357 = 155
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4) 2x - 15 = 13
2x = 13 + 15
2x = 28
x = 28 : 2
x = 14
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5) 7y - 25 - 45 = 0
7y - 25 = 45
7y = 45 + 25
7y = 70
y = 70 : 7
y = 10
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6) 130 - 4x - 70 = 0
130 - 4x = 70
-4x = -130 - 70
-4x = 60
x = 60 : 4
x = 15
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7) 49 - 3x - 34 = 0
49 - 3x = 34
-3x = -49 - 34
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8) 9y - 89 - 55 = 0
9y - 89 = 55
9y = 55 + 89
9y = 144
y = 144 : 9
y = 16
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9) 74 - 82 - 2 = -10