bai 17
1/ab+ac
2/ab-ac+ad
3/ax-bx-cx+dx
4/a(b+c)-d(b+c)
5/ac-ad+bc -bd
6/ax+by+bx+ay
giup minh voi cac ban
bai 17 1/ab+ac 2/ab-ac+ad 3/ax-bx-cx+dx 4/a(b+c)-d(b+c) 5/ac-ad+bc -bd 6/ax+by+bx+ay giup minh voi cac ban
By Elliana
By Elliana
bai 17
1/ab+ac
2/ab-ac+ad
3/ax-bx-cx+dx
4/a(b+c)-d(b+c)
5/ac-ad+bc -bd
6/ax+by+bx+ay
giup minh voi cac ban
1/ ab + ac
= a(b + c)
2/ ab – ac + ad
= a(b – c + d)
3/ ax – bx – cx + dx
= x(a – b – c + d)
4/ a(b + c) – d(b + c)
= (b + c)(a – d)
5/ ac – ad + bc – bd
= a(c – d) + b(c – d)
= (c – d)(a + b)
6/ ax + by + bx + ay
= (ax + ay) + (bx + by)
= a(x + y) + b(x + y)
= (x + y)(a + b).
Đáp án:
Câu 1: $=a(b+c)$
Câu 2: $=a(b-c+d)$
Câu 3: $=x(a-b-c+d)$
Câu 4: $= (b + c)(a – d) $
Câu 5: $= (b + c)(a – d) $
Câu 6: $=(a+b)(x+y)$
Giải thích các bước giải:
Câu 1: $ab+ac$
$=a(b+c)$
Câu 2: $ab-ac+ad$
$=a(b-c+d)$
Câu 3: $ax-bx-cx+dx$
$=x(a-b-c+d)$
Câu 4: $a(b+c)-d(b+c)$
$= (b + c)(a – d) $
Câu 5: $ac-ad+bc -bd$
$=a(c-d)+b(c-d)$
Câu 6: $ax+by+bx+ay$
$=(ax+ay)+(by+bx)$
$=a(x+y)+b(y+x)$
$=(a+b)(x+y)$