1:Rút gọn A=a.(b-c)-b.(a+c)+c.(a+b)+2021 B=(a+b).(c-d)-(a-d).(b+c)+(a-c).(b+d) help me 09/11/2021 Bởi Rylee 1:Rút gọn A=a.(b-c)-b.(a+c)+c.(a+b)+2021 B=(a+b).(c-d)-(a-d).(b+c)+(a-c).(b+d) help me
Đáp án+Giải thích các bước giải: $A=a.(b-c)-b.(a+c)+c.(a+b)+2021$ $A=ab-ac-ba-bc+ca+bc+2021$$A=2021$ $B=(a+b).(c-d)-(a-d).(b+c)+(a-c).(b+d)$ $B=ac-ad+bc-bd-ab-ac+bd+cd+ab+ad-bc-cd$ $B=$0 Cho mình xin hay nhất nhé. Học tốt $#伝説$ Bình luận
$\text{A = a.(b-c) – b.(a+c) + c.(a+b) + 2021}$ $\text{A = a.b – a.c – b.a +b.c + c.a + c.b + 2021}$ $\text{A = [(a.b) – (b.a)] + [(a.c) – (c.a)] + [(b.c) – (c.b)] + 2021}$ $\text{A = 0 + 2021}$ $\text{A = 2021}$ $\text{B = (a + b) . (c – d) – (a – d) . (b + c) + (a – c) . (b + d)}$ $\text{B = a.c – a.d + b.c – b.d – a.b – a.c + b.d + c.d +a.b +a.d – b.c – c.d}$ $\text{B = 0}$ $\text{@Star}$ Bình luận
Đáp án+Giải thích các bước giải:
$A=a.(b-c)-b.(a+c)+c.(a+b)+2021$
$A=ab-ac-ba-bc+ca+bc+2021$
$A=2021$
$B=(a+b).(c-d)-(a-d).(b+c)+(a-c).(b+d)$
$B=ac-ad+bc-bd-ab-ac+bd+cd+ab+ad-bc-cd$
$B=$0
Cho mình xin hay nhất nhé. Học tốt $#伝説$
$\text{A = a.(b-c) – b.(a+c) + c.(a+b) + 2021}$
$\text{A = a.b – a.c – b.a +b.c + c.a + c.b + 2021}$
$\text{A = [(a.b) – (b.a)] + [(a.c) – (c.a)] + [(b.c) – (c.b)] + 2021}$
$\text{A = 0 + 2021}$
$\text{A = 2021}$
$\text{B = (a + b) . (c – d) – (a – d) . (b + c) + (a – c) . (b + d)}$
$\text{B = a.c – a.d + b.c – b.d – a.b – a.c + b.d + c.d +a.b +a.d – b.c – c.d}$
$\text{B = 0}$
$\text{@Star}$