Объяснение:
1.
(a+2)(b-3)=ab-3a+2b-6
(4x-y)(2x-3y)=8x²-12xy-2xy+3y²=8x²-14xy+3y²
(x-4)(x-11)=x²-11x-4x+44=x²-15x+44
(2-3x)(3x²+10x)=6x²+20x-9x³-30x²=-9x³-24x²+20x
2.
(x+2)(x-5)-3x(1-2x)=x²-5x+2x-10-3x+6x²=7x²-6x-10
(x+7)(x-2)-(6+x)(4-x)=x²-2x+7x-14-24+6x-4x+x²=2x²+7x-38
3.
4x-16y=4(x-4y)
4ab+8ac=4a(b+2c)
12x²y-3xy=3xy(4x-1)
3x(a-b)-5y(a-b)=(a-b)(3x-5y)
4.
ab-ac+yb-yc=a(b-c)+y(b-c)=(a+y)(b-c)
6mn-3m+2n-1=3m(2n-1)+2n-1=(3m+1)(2n-1)
5.
(x+3)(x-2)-(x+4)(x-1)=3x
x²-2x+3x-6-x²+x-4x+4=3x
-5x-2=0
5x=-2
x=-2/5=-0,4
Объяснение:
1.
(a+2)(b-3)=ab-3a+2b-6
(4x-y)(2x-3y)=8x²-12xy-2xy+3y²=8x²-14xy+3y²
(x-4)(x-11)=x²-11x-4x+44=x²-15x+44
(2-3x)(3x²+10x)=6x²+20x-9x³-30x²=-9x³-24x²+20x
2.
(x+2)(x-5)-3x(1-2x)=x²-5x+2x-10-3x+6x²=7x²-6x-10
(x+7)(x-2)-(6+x)(4-x)=x²-2x+7x-14-24+6x-4x+x²=2x²+7x-38
3.
4x-16y=4(x-4y)
4ab+8ac=4a(b+2c)
12x²y-3xy=3xy(4x-1)
3x(a-b)-5y(a-b)=(a-b)(3x-5y)
4.
ab-ac+yb-yc=a(b-c)+y(b-c)=(a+y)(b-c)
6mn-3m+2n-1=3m(2n-1)+2n-1=(3m+1)(2n-1)
5.
(x+3)(x-2)-(x+4)(x-1)=3x
x²-2x+3x-6-x²+x-4x+4=3x
-5x-2=0
5x=-2
x=-2/5=-0,4