Question

упростите выражение ( 714,715)

Answer 1

715

б)

$2x {}^{2} - 3xy - 2xy + 3y {}^{2} - 6x {}^{2} - 3xy + 2xy + y {}^{2} = - 4x {}^{2} - 6xy + 4y {}^{2}$

г)

$3cd + 9c {}^{2} - d {}^{2} - 3cd + 4c {}^{2} - 16c {}^{2} - cd + 4d {}^{2} = - 3c {}^{2} - cd + 3d {}^{2}$

Answer 2

N°714

б)(3m²+3n²)-(2m+n)(m+2n)

3m²+3n²-(2m²+4mn+mn+2n²)

3m²+3n²-2m²-4mn-mn-2n²

m²+n²-5mn

m²-5mn+n²

г)(c-5)(c-10)+3c(c+5)

c²-10c-5c+50+3c²+15c

4c²+50

N°715

б)(x-y)(2x-3y)-(3x-y)(2x+y)

2x²-3xy-2xy+3y²-(6x²+3xy-2xy-y²)

2x²-3xy-2xy+3y²-6x²-3xy+2xy+y²

-4x²-6xy+4y²

г)(3c-d)(d+3c)+(4c-d)(c-4d)

9c²-d²+(4c²-16cd-cd+4d²)

9c²-d²+4c²-16cd-cd+4d²

13c²+3d²-17cd

13c²-17cd+3d²