Ответ:

1)9(3х+1)-4(2х-7)=27х+9-4х+28=25х+37

2)4(х-5)-5(х+6)=4х-20-5х-30=-х-50

3)-3b(5a-b)+6a(3b-a)=-15ab+3b^2+18ab-6a^2=3ab+3b^2-6a^2

4c(2c+3p)-2p(c-4p)=8c^2+12cp-2cp+8p^2=8c^+10cp+8p^2

5)-3y(2x-5y)-2y(5x-4y)=-6xy+15y^2-10xy+8y^2=-16xy+23y^2

6)6x(x+4)+3x(x-7)=

Объяснение:

6x^2+24x+3x^2-21x=9x^2+3x

7)10x^3(4x+5)-8x(2x^3-x^2=40x^4+50x^3-16x^4-8x^3=24x^4-42x^3