а) 2(25-x²)= 2(5-x)(5+x)
б) a(x²-y²)= a(x-y)(x+y)
в) 7(c²-2c+1)= 7(c-1)²
г) 5(x²+2xy+y²)= 5(x+y)²
а) (m-n)(m+n)+(m-n)= (m-n)(m+n+1)
б) (y-2)(y-2-y)= -2(y-2)
3) 2(a²-2ab+b²)= 2(a-b)²= 2*7²= 98
1) (81-19)²/(81-19)(81+19)= (81-19)/(81+19)= 62/100= 0,62
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а) 2(25-x²)= 2(5-x)(5+x)
б) a(x²-y²)= a(x-y)(x+y)
в) 7(c²-2c+1)= 7(c-1)²
г) 5(x²+2xy+y²)= 5(x+y)²
а) (m-n)(m+n)+(m-n)= (m-n)(m+n+1)
б) (y-2)(y-2-y)= -2(y-2)
3) 2(a²-2ab+b²)= 2(a-b)²= 2*7²= 98
1) (81-19)²/(81-19)(81+19)= (81-19)/(81+19)= 62/100= 0,62
Б)a(x-y)(x+y)
В)7(с-2)^2
Г)5(х+y)^2
Задание 2
А)(m-n)(m+n+1)
Б)-2(у-2)
Задание 3
2(a-b)^2=2*14=28
Задание 4
6561-3078 +361/(81-19)(81-19)
3844/62*100
3844/6200
31/50 или 0,62