Question

Rút gọn biểu thức

a) E= 2.(a+b)+3.(a-c)-4.(b+c)

b) F= 3.(b-c)-(a+c)+5.(a-b-c)

c) G=7.(a-b-c)+4.(b+c)-6.(b-c-a)

d) H=5.(a-b+c)-3.(a-b)-2.(b+c)

Answer 1

b) F=3.(b-c)-(a+c)+5.(a-b-c)

   F=3b-3c-a-c+5a-5b-5c

   F=(-a+5a)+(3b-5b)+(-3c-c-5c)

  F= 4a+(-2b)+(-9c)

  F=4a-2b-9c

Answer 2

a) E=2.(a+b)+3.(a-c)-4(b+c)

   E=2a+2b+3a-3c-4b-4c

   E=(2a+3a)+(2b-4b)+(-3c-4c)

   E=5a+(-2b)+(-7c)=5a-2b-7c

Answer 3

c)G=7.(a-b-c)+4.(b+c)-6(b-c-a)

G=7a-7b-7c+4b+4c-6b+6c+6a

G=(7a+6a)+(-7b+4b-6b)+(-7c+4c+6c)

G=13a+(-9b)+3c

G=13a-9b+3c

Answer 4

d)H=5.(a-b+c)-3.(a-b)-2.(b+c)

H=5a-5b+5c-3a+3b-2b-2c

H=(5a-3a)+(-5b+3b-2b)+(5c-2c)

H=2a+(-4b)+3c

H=2a-4b+3c

Answer 5

K cho mình nha Phạm Minh Nhi