Bài tâp.â Mô ôt mảnh vườn hình chữ nhâ ôt có chiều dài x (m), chiều rô ông y (m) với (x>6 và y>6). Người ta mở mô ôt lối đi xung quanh vườn thuô ôc đất của vườn rô ông 3 m. a./ Hỏi chiều dài, chiều rô ông của khu đất còn lại để trồng trọt là bao nhiêu (m) ? b./ Viết biểu thức tính diê ôn tích của khu đất còn lại để trồng trọt ? c./ Nếu x= 106m, y=86m thì khi đó diê ôn tích khu đất trồng trọt là bao nhiêu ?

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