Question

Rút gọn biểu thức:

E=(-a-b+c+d)-(d+c-b-2a)

F=(a-2b-c+2d)-(3d-2c-3b+a)+15

G=a(2b-c)-b(a+c)-a(c+b)

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

help me!!!!!!!!!!!!!!!!!!!!!!

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GIẢI ĐẦY ĐỦ NHA

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Answer 1

E=(-a-b+c+d)-(d+c-b-2a)

E=-a-b+c+d-d-c+b+2a

E=-a+(-)b+c+d+(-d)+(-c)+b+2a

E=-a+(-b)+c+d+(-d)+(-c)+b+2a

E=(2a-a)+(-b+b)+(-d+d)+(-c+c)=a+0+0+0=a

Answer 2

thanks nhiều nha ĐỨC THỊNH

Answer 3

F=(a-2b-c-2d)-(3d-2c-3b+a)+15

F=a-2b-c-2d-3d+2c+3b-a+15

F=a+(-2b)+(-c)+(-2d)+(-3d)+2c+3b+(-a)+15

F=(-2b+3b)+(-c+2c)+[-2d+(-3d)]+(-a+a)+15

F=b+c+(-5d)+0+15=b+c+(-5d)+15

Answer 4

G=a(2b-c)-b(a+c)-a(c+b)

G=2ab-ac-ab+c-ac+ab

G=2ab+(-ac)+(-ab)+c+(-ac)+ab

G=(2ab+ab)+[-ac+(-ac)]+(-ab)+c

G=3ab+-2ac+(-ab)+c

G=2ab+-2ac+c=2(ab+ac)+c