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A) x^3*x/(x^2)^2=x^4/x^4=x
б) <span>(-0,4 a^3 b)^2=0,16a^6 b^2
</span><span>в) (m^3 * m^2)^2 * (2m)^3=(m^5)^2*8m^3=m^10*8m^3=8m^13</span>
<span>99²-2*99*111+111²=(111-99)</span>²=12²=144
Делаем по действиям.
14-4*1,5-8=14-6-8=8-8=0