Разложите на множители многочлен #707

1) 2(a^2–b^2)=2(a–b)(a+b)2) c(x^2–y^2)=c(x–y)(x+y)3) 3(x^2–1)=3(x–1)(x+1)4) 3a(b^2–9)=3a(b–3)(b+3)5) x(x^2–4)=x(x–2)(x+2)6) 2y(y^2–9)=2y(y–3)(y+3)7) x^4–x^2=(x^2–x)(x^2+x)8) t^4(0,09–t^2)=t^4(0,3–t)(0,3+t)9) b^2c^3(4/7abc–1)(4/7abc+1)