1). <span>16³ : (4⁻²)⁻³ = (2⁴)³ : ((2²)⁻²)⁻³ = 2¹² : 2¹² = 2⁰ = 1</span>
<span>2). b6=5*6-4=30-4=26</span>
<span>3). <span>0,8n-(1/8m+7,5n-5) = 0,8n-1/8m-7,5n+5 = 5-1/8m-6.7n</span></span>
<span><span>4). <span>(a-b)³+b³ = <span>a</span><var>3</var><em>−</em><var>3</var><span>ba</span><var>2</var><em>+</em><var>3</var><span>ab</span><var>2</var><em>−</em><span>b³ + b³ = a<var>3</var><em>−</em><var>3</var>ba<var>2</var><em>+</em><var>3</var>ab² = a(a²-3ba+3b²)</span></span></span></span>
<span><span><span><span>5). <span>(√5-√2)</span>² = 5-2√2*√5+2=7-2√10≈0.68</span></span></span></span>
<span><span><span><span>6). <span>(1-√6)²(1+√6)²-(1-√5)²(1+√5)² = ((1-√6)*(1+√6))²- ((1-√5)*(1+√5))² = (1-6)² - (1-5)² = 25-16=9</span></span></span></span></span>
<span><span><span><span><span>7). <span>2x²-7x+5 =0</span></span></span></span></span></span>
<span><span><span><span><span><span> Д=49-40=9 - 2корня</span></span></span></span></span></span>
<span><span><span><span><span><span> х1=(7+3)/4=10/4=5/2=2,5</span></span></span></span></span></span>
<span><span><span><span><span><span> х2=(7-3)/4=4/4=1</span></span></span></span></span></span>
<span><span><span><span><span><span>тогда 2x²-7x+5 = 2*(х-2,5)(х-1)</span></span></span></span></span></span>
