<span>Готово!..................</span>
а=0,0175
b=1,000
a<b
1/15+4/5=общей знаменатель 15 так как он делится и на 15 и 5
Значит приводим к общему знаминателю
1/15+12/15=13/15
#1
k=y/x
k=8/-4
y=-2x
#2
k=-9/2=-4,5
y=-4,5x-3
1)(2a-3)²=4a²-12a+9=(3-2a)²
![\frac{4a^2b}{(2a-3)^2}- \frac{9b}{(3-2a)^2} = \frac{4a^2b}{(2a-3)^2}- \frac{9b}{(2a-3)^2} = \frac{4a^2b-9b}{(2a-3)^2}= \frac{b(4a^2-9)}{(2a-3)^2} = \\ \\ = \frac{b(2a-3)(2a+3)}{(2a-3)^2} =\frac{b(2a+3)}{2a-3}](https://tex.z-dn.net/?f=%20%5Cfrac%7B4a%5E2b%7D%7B%282a-3%29%5E2%7D-%20%5Cfrac%7B9b%7D%7B%283-2a%29%5E2%7D%20%3D%20%5Cfrac%7B4a%5E2b%7D%7B%282a-3%29%5E2%7D-%20%5Cfrac%7B9b%7D%7B%282a-3%29%5E2%7D%20%3D%20%20%5Cfrac%7B4a%5E2b-9b%7D%7B%282a-3%29%5E2%7D%3D%20%5Cfrac%7Bb%284a%5E2-9%29%7D%7B%282a-3%29%5E2%7D%20%3D%20%5C%5C%20%20%5C%5C%20%3D%20%20%5Cfrac%7Bb%282a-3%29%282a%2B3%29%7D%7B%282a-3%29%5E2%7D%20%3D%5Cfrac%7Bb%282a%2B3%29%7D%7B2a-3%7D%20)
2) (x-3y)³ = - (3y-x)³
![\frac{ x^{2} }{(x-3y)^3} + \frac{9y^2}{(3y-x)^3}= \frac{ x^{2} }{(x-3y)^3} - \frac{9y^2}{(x-3y)^3}= \frac{ x^{2}-9y^2 }{(x-3y)^3}= = \frac{ (x-3y)(x+3y) }{(x-3y)^3}= \\ \\ = \frac{ x+3y }{(x-3y)^2}= \frac{ x+3y }{(3y-x)^2}](https://tex.z-dn.net/?f=%20%5Cfrac%7B%20x%5E%7B2%7D%20%7D%7B%28x-3y%29%5E3%7D%20%2B%20%5Cfrac%7B9y%5E2%7D%7B%283y-x%29%5E3%7D%3D%20%20%5Cfrac%7B%20x%5E%7B2%7D%20%7D%7B%28x-3y%29%5E3%7D%20-%20%5Cfrac%7B9y%5E2%7D%7B%28x-3y%29%5E3%7D%3D%20%5Cfrac%7B%20x%5E%7B2%7D-9y%5E2%20%7D%7B%28x-3y%29%5E3%7D%3D%20%3D%20%5Cfrac%7B%20%28x-3y%29%28x%2B3y%29%20%7D%7B%28x-3y%29%5E3%7D%3D%20%5C%5C%20%20%5C%5C%20%3D%20%5Cfrac%7B%20x%2B3y%20%7D%7B%28x-3y%29%5E2%7D%3D%20%5Cfrac%7B%20x%2B3y%20%7D%7B%283y-x%29%5E2%7D)