2 пятых минус 0.7 = 0.4-0.7 = - 0.3
<span>(1/7xy)⁴*(-49axy)²*(-2ay)⁶</span>= (1/2401x^4y^4)*(2401a^2x^2y^2)*(64a^6y^6) = 64a^8x^6y^12
(x-3)²=х²-6х+9
(a-2)(a+2)=а²-4
(2a+5b)²=4а²+20ab+25b²
(3x-y)(y+3x)=(3x-y)(3x+y)=9x²-y²
<span>4n-m 3m+n 12mn-3m^2-12mn-4n^2 -3m^2-4n^2
--------- ---------= ---------------------------------- =------------------
20mn² - 15m²n 60m^2n^2 60m^2n^2
</span>
<span> 8 8+x^3-2x^2+2x^2-4x+4x-8 x^3
---- </span><span>+ x² + 2x + 4=------------------------------------------------</span>=--------
<span>x-2 x-2 x-2
</span>b+3 b-1 b+3 b-1 b^2+3b-9b+9 <span>(b-3)^2</span> b-3
------ ------- =-------------- - ---------------= ---------------------=----------------------=---------
9b-27 - b² - 3b 9(b-3) b(b-3) 9b(b-3) 9b(b-3) 9b