<span>1)3ab+7ac=a(3b+7c)
</span><span>2)5a^3b-2a^2b^2=ab(5a^2-2ab)
</span><span>3)6b^3-3b=3b(2b^2-1)</span>
1.43 верно
1.44 я не уверена,что так
A+B+C=7x+8-2-6x+6+x+x²=x²+2x+12
16-k²=(4-k)(4+k)
t²-225=(t-15)(t+15)
y²-16/81=(y-4/9)(y+4/9)
25/36-64y²=(5/6-8y)(5/6+8y)