Verified answer

Объяснение:

4b²-(7b²-3bc)+(3b²-7bc)=4b²-7b²+3bc+3b²-7bc=-4bc

-4bc=-4(-1,5)*4=24

6х(6х-4)+9х(3-4х)=36х²-24х-27х-36х²=-51х

-51х=-51(-1)=51

(х+2)(х-5)-(х-3)(х+4)=х²+2х-5х-10-х²+3х-4х+12=-4х+2

-4х+2=-4(-5,5)+2=24