Question

7класс
#943 пожалуйста

Answer 1

943.
a) 45b+6a-3ab-90=(45b-90)-(3ab-6a)=45(b-2)-3a(b-2)=(b-2)(45-3a)=3(15-a)(b-2)

б) -5xy-40y-15x-120=(-5xy-15x)-(40y+120)=-5x(y+3)-40(y+3)=
    =(y+3)(-5x-40)=-5(x+8)(y+3)

в) ac⁴-c⁴+ac³-c³=(ac⁴-c⁴)+(ac³-c³)=c⁴(a-1)+c³(a-1)=(a-1)(c⁴+c³)=
    =c³(c+1)(a-1)

г) x²-a²-10a-25=x²-(a²+10a+25)=x²-(a+5)²=(x-a-5)(x+a+5)

Answer 2

45b + 6a -3ab - 90 = 45b - 90 + 6a - 3ab = 45( b - 2) + 3a(2 - b) = ( b - 2)(45 - 3a)
-5xy - 40y - 15x - 120 = -5xy - 15x - 40y - 120 = -5x(y +3) - 40(y + 3)
= (-5x-40)(y+3)
ac⁴-c⁴+ac³-c³=c⁴(a-1)+c³(a-1)=(a-1)(c⁴+c³)
x²(x-y)+x(x-y)=(x-y)(x²+x)