7^(x + 4y) = 7^2
3^(y - 2x) = 3^(-1)
x + 4y = 2 | *2
y - 2x = -1
2x + 8y = 4
-2x + y = -1
9y = 3
x = 2 - 4y
y = 1/3
x = 2 - 4/3 = 6/3 - 4/3 = 2/3
2/3 + 1/3 = 3/3 = 1
Ответ: 1)
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7^(x + 4y) = 7^2
3^(y - 2x) = 3^(-1)
x + 4y = 2 | *2
y - 2x = -1
2x + 8y = 4
-2x + y = -1
9y = 3
x = 2 - 4y
y = 1/3
x = 2 - 4/3 = 6/3 - 4/3 = 2/3
2/3 + 1/3 = 3/3 = 1
Ответ: 1)
2/3+1/3=3/3=1