A11=a1+10d
a11=-2,4+10*0,8=-2,4+8=5,6
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log2 240 - log2 3.75=log2 240\3/74=log 2 64 =6
A) x⁻²·x⁴/x⁻⁶ = x²/x⁻⁶ = x²·x⁶ = x⁸
При x = 2:
x⁸ = 2⁸ = 256
б) z⁻⁵/z·z⁻³ = z⁻⁵/z⁻² = z⁻³
При z = -1/3:
z⁻³ = (-1/3)⁻³ = -27
в) y⁻¹⁰·(y⁻²)⁻⁴ = y⁻¹⁰·y⁸ = y⁻²
При y = 0,125:
y⁻² = (0,125)⁻² = (1/8)⁻² = 8² = 64