a) ( 4 - x ) . ( x + 3 ) = 0

Ta có các trường hợp sau đây :

\(\orbr{\begin{cases}4-x=0\\x+3=0\end{cases}}​\orbr{\begin{cases}x=4-0=4\\x=0-3=-3\end{cases}}\)

==> x = -3 ; 4

b) 7. ( 2x - 8 ) = 0

        2x - 8 = 0 : 7

        2x - 8 = 0

        2x      = 0 + 8 =8

==> x = 8 : 2 = 4

c) -x . ( 8 + x ) = 0

Ta có các trường hợp sau đây :

\(\orbr{\begin{cases}-x=0\\8+x=0\end{cases}}\orbr{\begin{cases}x=0\\x=-8\end{cases}}\)

MÌNH HK CHẮC CÂU c) ÂU NHA, MÌNH THẤY CÁI NÀO CŨNG LẠ MÀ 0 CÓ THỂ ĐỂ LÀ -0 ĐƯỢC HK CÁC BẠN

Xin chào tất cả mọi người ạ !

Hôm nay mình xin phép được tổ chức sự kiện "Fanart in our heart"

Chủ đề đầu tiên của sự kiện là : Kimetsu no Yaiba

Các bạn sẽ vẽ nhân vật bất kì trong bộ anime Kimetsu no Yaiba nhé !

Cơ cấu giải thưởng :

- Xét về điểm :

+ Giải nhất : 30SP

+ Giải nhì : 20SP

+ Giải ba : 10SP

- Xét về lượt thích ( số SP mà tranh bạn được tick )

+ Giải nhất : 30SP

+ Giải nhì : 20SP

+ Giải ba : 10SP

Luật :

- Các bạn có tối đa 10 điểm

- Tranh chép : -1,5đ ( ưu tiên tự nghĩ hơn nhé )

- Tranh mạng, sai chủ đề, gây war, drama, tranh 18+, không có chữ kí hoặc tên trên Hoc24, đăng lại tranh của vòng trước : OUT và bị xóa câu trả lời

- Tranh mờ : -0,5đ

- Chưa line : -0,5đ

- Lệch : -1đ/một chi tiết

- Chưa tô màu : -1đ ( tô màu gì cũng được nhé, kể cả màu đơn )

- Line đứt nét : -2đ ( cái này là lười, ẩu chứ không phải line xấu nhé )

- Nét cứng : -0,5đ

- Tranh không đẹp : -1,5đ

- Không đăng tranh gốc : -5đ ( chỉ áp dụng cho tranh chép )

- Tranh anime, chibi đều được

- Không đăng câu trả lời spam

BGK : tuyển 2 người

Đối tượng tham gia thi : tất cả các thành viên trên Hoc24 ( kể cả BTC - mình )

Trao giải vào chủ nhật tuần sau nhé !

Hết rồi đó !

CHO MINH CACH LAM CHI TIET NHE

hinh 2

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