Task/25769342
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Известно : 5x²y³ = 8 <span>.
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</span>Найти
1)<span> 45</span>x²y³ = 9*5<span>x²y³ =9*8 = 72.
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2) 3</span>x²y³ =(3/5)*5<span>x²y³</span><span> =0,6*8 = 4,8.
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3) - 5,5</span>x²y³ = -1,1*5<span>x²y³ = -1,1*8 = - 8,8.
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4) 25x</span>⁴y⁶ =(5x²y³)² = 8² = 64.
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5) 125x⁶y⁹ =(5x²y³)³ =8<span>³ = 512.
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6) 625/128 x⁸y¹² = (1/128)*(5x²y³)⁴ =(1/128)*8<span>⁴ =64*64/128 = 32.</span>
Решение смотри в приложении
a) (2,5х+3)(4х-1)-2,5х(4х+2)<3
10x^2-2,5х+12х-3-10x^2-5х<3
4.5x<9
x<2
б)(1-4х)^2-(8х-1)(2х+1)>0
1-8х+16х^2-16x^2-8x+2x+1>0
-14x>-2
x<1/7