Question

2.103 . Өрнекті ықшамдаңдар​

Answer 1

Ответ:

1) $(2x+1)*(x+4)=2x*x+2x*4+x+4=2x^2+8x+x+4=2x^2+9x+4$

2) $(2x+3)*(5x-4)=2x*5x-2x*4+3*5x-3*4=10x^2-8x+15x-12=$

$=10x^2+7x-12$

3) $(3x-2)*(2a-1)=3x*2a-3x-2*2a-2*(-1)=6ax-3x-4a+2$

4) $(5a-3b)*(4a-b)=5a*4a-5ab-3b*4a-3b*(-b)=20a^2-5ab-12ab+3b^2=$

$=20a^2-17ab+3b^2$

5) $(2m+3n)*(2m-5n)=2m*2m-2m*5n+3n*2m-3n*5n=$

$=4m^2-10mn+6mn-15n^2=4m^2-4mn-15n^2$

6) $(3x+2y)*(x-y)=3x*x-3xy+2xy-2y*y=3x^2-3xy+2xy-2y^2=$

$=3x^2-xy-2y^2$

7) $(5b-4c)*(2b-2c)=5b*2b-5b*2c-4c*2b-4c*(-2c)=$

$=10b^2-10bc-8bc+8c^2=10b^2-18bc+8c^2$

8) $(p-3q)*(8p+5q)=p*8p+5pq-3q*8p-3q*5q=8p^2+5pq-24pq-15q^2=$

$=8p^2-19pq-15q^2$