Ta có:
a(b-c)-c(b-d)+a(c+d)+bc
=ab-ac-bc+cd+ac+ad+bc
=ab+cd+ad
Hok tốt !!!
a( b-c ) - c(b-d) + a(c+d) +bc
= ab -ac - bc + cd + ac + ad + bc
=ab + cd + ad
Các câu hỏi tương tự
Bo dau ngoac roi rut gon bieu thuc :
a) - ( -a + c - d ) - ( c- a + d )
b) - ( a + b - c + d ) + ( a - b - c - d )
c) a( b- c -d ) - a( b + c - d )
Giup minh nhe minh dang can gap
Bo dau ngoac va thu gon bieu thuc:
a) (a+b)(2a+b)
b) (2a-b)(a-b)
c) (2a+b)(2a-b)
Bo dau ngoac roi rut gon bieu thuc :
A= a .( 5-b) + b . ( a- 5) - (5a + 3b )
B = ( x-1 ) . (x-2) - ( x2 + x + 8 )
Bo dau ngoac roi rut gon bieu thuc :
a) - ( - 12 + 25 - 36 ) - ( 12 - 36 + 57 )
b) - ( 23 + 5 - 6 + 17 ) + ( 23 - 5 - 83 - 6 )
c) 12 . ( 6 - 7 - 8 ) - 10 . ( 11 + 12 - 13 )
Giup minh voi minh dang can rat gap
thu gon roi tinh bieu tri cua bieu thuc;
d=(10-a+b)-(10-b+c)-(10-c-a)
Bo dau ngoa ri thu gon bieu thuc
A=(a+b)-(a-b)+(a-c)-(a+c)
B=(a+b-c)+(a-b+c)-(b+c-a)-(a-b-c)
Bo dau ngoa ri thu gon bieu thuc
A=(a+b)-(a-b)+(a-c)-(a+c)
B=(a+b-c)+(a-b+c)-(b+c-a)-(a-b-c)
Bo ngoac roi rut gon:-a-(b-a-c)
don gian bieu thuc khi bo ngoac
-(a-b+c)-(a+b+c)