Toán a, (a+b-c)+(b+c-d). b, (a+b-c)-(b-c+d). c, -(b+c-d)-(a-b-c). 01/08/2021 By Josie a, (a+b-c)+(b+c-d). b, (a+b-c)-(b-c+d). c, -(b+c-d)-(a-b-c). d, -(2a+b+c)-(b+c). e, -(4a+b)-(b-3a)
Đáp án: CHÚC EM HỌC TỐT Giải thích các bước giải: A). (a+b-c)+(b+c-d) =. a+b-c+b+c-d =. a+2b-d B). (a+b-c)-(b-c+d) =. a+b-c-b+c-d =. a-d C). -(b+c-d)-(a-b-c) =. -b-c+d-a+b+c =. d-a D). -(2a+b+c)-(b+c) =. -2a-b-c-b-c =. -2a-2b-2c E). -(4a+b)-(b-3a) =. -4a-b-b+3a =. -a-2b Trả lời
a. ( a + b – c ) + ( b + c – d ) = a + b – c + b + c – d = a + 2b – d b. ( a + b – c ) – ( b – c + d ) = a + b – c – b + c – d = a – d c. – ( b + c – d ) – ( a – b – c ) = – b – c + d – a + b + c =d – a d. – ( 2a + b + c ) – ( b + c ) = – 2a – b – c – b – c = – 2a – 2b – 2c e. – ( 4a + b ) – ( b – 3a ) = – 4a – b – b + 3a = – a – 2b Trả lời
Đáp án:
CHÚC EM HỌC TỐT
Giải thích các bước giải:
A). (a+b-c)+(b+c-d)
=. a+b-c+b+c-d
=. a+2b-d
B). (a+b-c)-(b-c+d)
=. a+b-c-b+c-d
=. a-d
C). -(b+c-d)-(a-b-c)
=. -b-c+d-a+b+c
=. d-a
D). -(2a+b+c)-(b+c)
=. -2a-b-c-b-c
=. -2a-2b-2c
E). -(4a+b)-(b-3a)
=. -4a-b-b+3a
=. -a-2b
a. ( a + b – c ) + ( b + c – d )
= a + b – c + b + c – d
= a + 2b – d
b. ( a + b – c ) – ( b – c + d )
= a + b – c – b + c – d
= a – d
c. – ( b + c – d ) – ( a – b – c )
= – b – c + d – a + b + c
=d – a
d. – ( 2a + b + c ) – ( b + c )
= – 2a – b – c – b – c
= – 2a – 2b – 2c
e. – ( 4a + b ) – ( b – 3a )
= – 4a – b – b + 3a
= – a – 2b