2+ 3х - 3 = 2х - 6
1+ 3х = 2х-6
х=7
a)х-(2x+3)+(2-0.5x)=x-2x-0.5x+3+2=-1.5+5=-3.5
б)2+3(y-1/3) -2(0.5+y)=2+3-2-1/3+0.5+y=три целых 5/6
<span>a^4+4a^2+4-b^2=(a^2+2)^2-b^2=(a^2+2-b)(a^2+2+b)
</span>4(a-b)^2-9(a+b)^2=(2(a-b)-3(a+b))(2(a-b)+3(a+b))=(2a-2b-3a-3b)(2a-2b+3a+3b)=-(a+5b)(5a+b)
a^2-b^+2bc-c^2 проверьте правильность написанного вами задания после в чегото не хватает может так:<span>a^2-b^2+2bc-c^2=a^2-(b-c)^2=(a-b+c)(a+b-c)</span>
<span>|x^2-5x|-6>0
</span><span>|x^2-5x|>6</span>⇒
<span>[x</span>²-5x<-6 (1)
<span>[x</span>²-5x>6 (2)
<span>1)x</span>²-5x+6<0
<span>D=25-24=1>1
x1+x2=5 U x1*x2=6
x1=2 x2=3
+ _ +
-----------------(2)---------------------(3)------------------
2<x<3
2)x</span>²-5x-6>0
<span>D=25+24=49>0
x1+x2=5 U x1*x2=-6
x1=-1 x2=6
+ _ +
--------------(-1)------------------(6)--------------
x<-1 U x>6
Ответ x</span>∈(-∞;-1) U (2;3) U (6;∞)<span>
</span>
1. 13²-12² = 169 - 125 = √25 = 5
2. 21.8² - 18.2² = 475.24 - 331.24 = √144 = 12
3. 313² - 312² = 97969 - 97344 = √625 = 25
4. 17² - 64 = 289 - 64 = √225 = 15
5. 45.8² - 44.2² = 2097.64 - 1953.64 = √ 144 = 12
6. 117² - 108² = 13689 - 11664 = √2025 = 45
7. 6.8² - 3.2² = 46.24 - 10.24 = √36 = 6
8. 2 цел. 3/5 ² - 2 цел. 2/5² = 2 цел. 9/25 - 2 цел. 4/25 = √5/25 = 5/5 = 1