Ответы на вопрос:
а) 4.2у-2.7у=-59.8-0.95
1.5у= -60.75
у=(-40.5)
б)
424/164=b/3.3b=1400/164b=8,5
(a-b)(a+b)=a²-b² (a-b)²=a²-2ab+b² (3-k)²(k+3)²=(3-k)(3-k)(3+k)(3+k)=( (3-k)(3+k) )( (3-k)(3+k) )=(9-k²)(9-k²)= =(9-k²)²=81-18k²+k⁴ (x²-3y)(3y+x²)=(x²-3y)(x²+ 3y)=x⁴-9y²
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