X^2+2=-x+4
x^2+2+x-4=0
x^2+x-2=0 решаем квадратное уравнение по дискриминанту
д=1+8=9
x₁=-2 y₁=6
<span>x₂=1 y₂=3.</span>
<span>(a + 2b)² - (a + b)(b + a) = а</span>² + 4ab + b² - (a + b)² = а<span>² + 4ab + b² - a</span>² - 2ab - b² = 2ab
при а =1 и b = 1/5
2ab = 2 · 1 · 1/5 = 2/5
а)3⋅3⋅3⋅3⋅3 =3^5
б)7,5⋅7,5⋅7,5⋅7,5⋅7,5⋅7,5⋅7,5=7.5^7
в)13⋅13 =13^2
S=a*b/2 где а и b катеты
c^2=a^2+b^2
a=16 c=34
b=из под корня(34^2-16^2)=30
S=30*16/2=240
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<span>2d-4y</span> - <span>7d+3y </span> = <span>(2d-4y)*( 2d-3y)</span><span>-( 7d+3y )*( 2d-3y )</span> =