a) x⁴=625
x = 5
б) 6y⁶ = 384
y⁶ = 384 : 6
y⁶ = 64
y = 2
в) 9y⁵ = -288
y⁵ = -288/9
y⁵ = -32
г) 2x³ = -686
x³ = -686/2
x³ = 343
x = 7
д) 0,9a⁷ = -115,2
a⁷ = -115,2/0,9
a⁷ = -128
a = -2
e) -16c⁸ = -0,25
c⁸ = -0,25/-16
c⁸ = 0,015625
c = 0,8408
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Answers & Comments
a) x⁴=625
x = 5
б) 6y⁶ = 384
y⁶ = 384 : 6
y⁶ = 64
y = 2
в) 9y⁵ = -288
y⁵ = -288/9
y⁵ = -32
y = 2
г) 2x³ = -686
x³ = -686/2
x³ = 343
x = 7
д) 0,9a⁷ = -115,2
a⁷ = -115,2/0,9
a⁷ = -128
a = -2
e) -16c⁸ = -0,25
c⁸ = -0,25/-16
c⁸ = 0,015625
c = 0,8408