(2с+d)^2
_________________
= дробь, в числителе -1.6 умножить на 2.5, в знаменателе -1.2. Получается положительное число дробь. где в числителе 10. а в знаменателе 3 или 3 целых одна 3
<span>а)(1+3m)(1-3m)=1-9m^2</span>
<span><span>в)(2x-y)(2x+y)=4x^2-y</span></span>
<span><span><span>д)(4x+3y)(3y-4x)=-(4x+3y)(4x-3y)=-16x^2+9y^2</span></span></span>
<span><span><span><span>номер2</span></span></span></span>
<span><span><span><span><span>а)(x(^2)+2)(x(^2)-2)=x^4-4</span></span></span></span></span>
<span><span><span><span><span><span>в)(a(^2)-4)(a(^2)+4)=a^4-16</span></span></span></span></span></span>
<span><span><span><span><span><span><span>д)(ab-c)(ab+c)=a^2b^2-c^2</span></span></span></span></span></span></span>
<span><span><span><span><span><span>
</span></span></span></span></span></span>
<span><span><span><span><span><span>
</span></span></span></span></span></span>
<span><span><span>
</span></span></span>