Y=sinx-3x
y(Произв)=cosx-3
y=cosx+2x
y(Произв)=-sinx+2
Третье забыл xD
1) (61-39)×(61+39)=22×100=2200
2) (13,6-3,6)×(13,6+3,6)=10×17,2=172
(5¹³*6¹¹)/30¹¹ =(5¹¹*5²*6¹¹)/30¹¹=(30¹¹*5²)/30¹¹=5²=25
<span>(3-5у)(1+2у) = 3 +6у -5у -10у^2= 3 + y -10y^2
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а) x^2+2x
прибавь один: x^2+2x+1=(x+1)^2
б)<span> a²+4ab</span>
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<span>прибавь 4b^2: <span> a²+4ab+4b^2=(a+2b)^2</span></span>
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<span><span>в) <span>m² +1</span></span></span>
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<span><span><span>прибавь 2m: <span>m² +1 +2m=(m+1)^2</span></span></span></span>