<em>1. 27²/(3²)³=(3³)²/(3²)³=3⁶/3⁶=1.</em>
<em>2. 12⁴/3³*4³=3⁴*4⁴/3³*4³=3*4=12.</em>
<em>3. 2¹³*3¹³/6¹¹=6¹³/6¹¹=6²=36;</em>
<em>4. -</em>
<em>5. (2+5/16*(-2)⁴)²=(2+5)²=7²=49.</em>
5(m^2-2mn+n^2)=5(m-n)^2=5(142-42)^2=50000
-3,2a³c³
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