Giải bài 27 trang 21 sách bài tập toán 9 - Cánh diều tập 1

Trong các cặp số \(\left( { - 1;0} \right),\left( {2; - 2} \right),\left( {6; - 1} \right),\left( {4; - 3} \right),\left( {0;\frac{{ - 3}}{5}} \right)\), có bao nhiêu cặp là nghiệm của phương trình \(3x + 5y = - 3.\) A. 1 B. 2 C. 3 D. 4

Tổng hợp Đề thi vào 10 có đáp án và lời giải

Toán - Văn - Anh

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Đề bài

Phương pháp giải - Xem chi tiết

Thay lần lượt từng giá trị x,y trong mỗi cặp số vào vế trái phương trình. Nếu vế trái bằng vế phải thì cặp số đó là nghiệm của phương trình.

Lời giải chi tiết

Thay lần lượt từng giá trị x,y trong mỗi cặp số vào vế trái phương trình đã cho, ta được: \(\begin{array}{l}3.\left( { - 1} \right) + 5.0 = - 3\\3.2 + 5.\left( { - 2} \right) = - 4 \ne - 3\\3.6 + 5.\left( { - 1} \right) = - 13 \ne - 3\\3.4 + 5.\left( { - 3} \right) = - 3\\3.0 + 5.\left( {\frac{{ - 3}}{5}} \right) = - 3\end{array}\) Vậy có 3 cặp thỏa mãn yêu cầu đề bài. Chọn đáp án C.

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3.6 trên 7 phiếu

💫 Giải bài 28 trang 21 sách bài tập toán 9 - Cánh diều tập 1 Giải các phương trình sau: a) \(\frac{{x + 1}}{{x - 1}} - \frac{{x - 1}}{{x + 1}} = \frac{{16}}{{{x^2} - 1}}\) b) \(\frac{2}{{{x^2} - 4}} - \frac{{x - 1}}{{x\left( {x - 2} \right)}} + \frac{{x - 4}}{{x\left( {x + 2} \right)}} = 0\)
🌳 Giải bài 29 trang 22 sách bài tập toán 9 - Cánh diều tập 1 Giải các hệ phương trình sau bằng phương pháp thế a) \(\left\{ \begin{array}{l}x - 3y = - 2\\7x + 2y = 9\end{array} \right.\) b) \(\left\{ \begin{array}{l}3x - \frac{y}{2} = - 1\\\frac{x}{4} - \frac{y}{3} = - \frac{2}{3}\end{array} \right.\)
ꦦ Giải bài 30 trang 22 sách bài tập toán 9 - Cánh diều tập 1 Giải các hệ phương trình sau bằng phương pháp cộng đại số: a) \(\left\{ \begin{array}{l}0,7x + 0,5y = 1,2\\ - x + 2y = 1\end{array} \right.\) b) \(\left\{ \begin{array}{l}5x + 2y = 2\\ - 15x - 6y = - 4\end{array} \right.\)
🔯 Giải bài 31 trang 22 sách bài tập toán 9 - Cánh diều tập 1 Hai khu công nghiệp A và B có tổng cộng 2 200 công nhân. Sau khi chuyển 100 công nhân ở khu A sang khu B thì \(\frac{2}{3}\) số công nhân ở khu A bằng \(\frac{4}{5}\) số công nhân ở khu B. Tính số công nhân ở mỗi khu công nghiệp lúc ban đầu.
🦩 Giải bài 32 trang 22 sách bài tập toán 9 - Cánh diều tập 1 Một công ty du lịch tiến hành giảm giá cho gói du lịch loại A trong các dịp lễ. - Tuần lễ kích cầu du lịch: Hà Nội đi Đà Lạt giảm 15% giá niêm yết, Hà Nội đi Huế giảm 10% giá niêm yết; - Ngày lễ Quốc tế Lao động: Hà Nội đi Đà Lạt giảm 20% giá niêm yết, Hà Nội đi Huế giảm 15% giá niêm yết. Trong tuần lễ kích cầu du lịch, nếu 3 gói du lịch loại A cho chuyến Hà Nội đi Đà Lạt và 2 gói du lịch loại A cho chuyển Hà Nội đi Huế thì khách hàng phải trả 15 000 000 đồng. Trong ngày lễ Quốc tế Lao động,

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Luyện Bài Tập Trắc nghiệm Toán 9 - Cánh diều - Xem ngay

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Giải bài 27 trang 21 sách bài tập toán 9 - Cánh diều tập 1

Tham Gia Group Dành Cho Lớp 9 - Ôn Thi Vào Lớp 10 Miễn Phí

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