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3a3-12ab2=<em><span>3a(a2-4b2)=3a(a-2b)(a+2b)</span></em>
1)2²×2³=2⁵=32
2)8×2⁻⁴=2³×2⁻⁴=2⁻¹=0,5
3)2⁻⁵/(2³/2⁶)=2⁻⁵/2⁻³=2³/2⁵=2⁻²=0,25
4)((-2)⁸×5³)/(5⁴×2¹⁰×10)=(2⁸×5³)/(5⁴×2¹⁰×2×5)=(2⁸×5³)/(5⁵×2¹¹)=5⁻²×2⁻³
5)(b⁻²×b)²/b⁻³=(b⁻¹)²×b³=b³×b⁻²=b
6)(x⁴/(x³×x²))⁻²×(x³/x²)/x=(x⁴/x⁵)⁻²×x/x=(x⁻¹)⁻²=x²
7)Плохо видно