Question

решите с 4 номера даю 22 балла

Answer 1

4 (a)
1) 2a+(3a-8b)=2a+3a-8b=5a-8b
2) -5b-(8a-5b)=-5b-8a+5b=-8a
3) 6x+(7-3x)=6x+7-3x=3x+7
4) -(4x-18)+18=-4x+18+18=(-4x+36):(-4)=x-9
(b)
1) (5-2b)-(7+10b)=5-2b-7-10b=(-12b-2):(-2)=6b+1
2) -(3c+5c)-(9c-6x)=-3c-5x-9c+6x=-12c+x
3) (2a-7y)-(5a-7y)=2a-7y-5a+7y=-3a+2y
4) (11p+9c)-(12+11p+11c)=11p+9c-12-11p-11c=(-12+2p):(-2)=6-p
(c)
1) x-(x+15)+(13+x)=x-x-15+13+x=x-2
2) (3a-21)-2a-(17-8a)=3a-21-2a-17+8a=9a-38
3) (2-4b)-(31b-6)-11=2-4b-31b+6-11=-35b-3

5 (a)
1) 7(5a+8)-11a=35a+57-11a=(24a+57):3=3a+19
2) 9x+3(15-8x)=9x+45-24x=(-15x+45):(-15)=x-3
3) 6(c+1)-6c-5=6c+6-6c-5=1
4) 19y+2(3-4y)+11y=19y+6-8y+11=11y+17
(b)
1) 13a-8(7a-1)=13a-56a+8=-43a+8
2) -2(2p-1)+4=-4p+2+4=(-4p+6):2=-2p+3
3) 21x-7-4(9x+3)=21x-7-36x-12=-15x-19
4) 33-8(11b-1)-2b=33-88b+8-2b=-91b+41