1
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1)1 11/24+13/36=1 33/72+26/72=1 59/72
2)1 59/72*1 44/100=131/72*144/100=262/100=2,62
3)8/15*5625/10000=3/10=0,3
4)2,62-0,3=2,32
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3
(3x+y)²+(3xy-1)²-(3x-y)²=(3x+y-3x+y)(3x+y+3x-y)+(3xy-1)²=2y*6x+9x²y²-6xy+1=
=9x²y²+6xy+1=(3xy+1)²
a)(3xy+1)(3xy+1)
б)2(3xy+1)²*1/2
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упрощение
1)<span>(p-4)x+2p-4(x+p)=0</span>
px-4x+2p-4x-4p=0
-8x-2p+px=0
(p-8)x-2p
2)<span>px+2(p+1)x+p+2=0</span>
px+2px+2x+p+2=0
3px+2x+p+2=0
(3p+2)x+p+2
3)<span>3x-5(2x-1)=2x-1</span>
<span>3x-10x+5-2x+1=0</span>
<span>-9x+6=0</span>
<span>x=-(6/9)=-(2/3)</span>
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Равнобедренный треугольник