A^5 * a^12 = a^(5+12) = a^17
Если степени, то складываем
Ответ на вопрос
216^2:48=9072
1)
a)(2x-7y)^2+(2x+7x)^2-8x^2=(4x^2-28xy+49y^2)+(4x^2+28xy+49y^2)-8x^2=98y^2
b)(2-3b^2)(3b^2+2)+(3b^2-1)^2=-9b^4+4+9b^4-9b^2+1=-6b^2+5
2)
a)(3x-5/8)-(3x+5x/12)=1
(-x-21/24)=1
-x-21=24
x=-45
b)(2x-3)(3x+2)=(2x+3)(x-2)
6x^2-5x-6=2x^2-x-6
4x^2-4x-6=-6
4x(x-1)=0
x=0;1
(2²+х)-(2²-х)=15
4+х-4+х=15
2х=15
х=15/2
х=7,5
Решение методом подстановки.<span><span>{<span><span>11x+3y=−5</span><span>14x−9y=8</span></span></span>⇒</span><span><span>{<span><span>y=−<span>113</span>x−<span>53</span></span><span>14x−9y=8</span></span></span>⇒</span><span><span>{<span><span>y=−<span>113</span>x−<span>53</span></span><span>14x−9<span>(−<span>113</span>x−<span>53</span>)</span>=8</span></span></span>⇒</span><span><span>{<span><span>y=−<span>113</span>x−<span>53</span></span><span>47x+7=0</span></span></span>⇒</span><span><span>{<span><span>y=−<span>113</span>x−<span>53</span></span><span>x=−<span>747</span></span></span></span>⇒</span><span>{<span><span>y=−<span>158141</span></span><span>x=−<span>747</span></span></span></span>Ответ:<span><span><span>(−<span>747</span>;−<span>158141</span>)</span>=<span>(−<span>747</span>;−1<span>17141</span>)</span>≈(−0,149;−1,121)</span></span>