`{(2x-1<=0),(5-8x<0):}<=>`$\begin{cases}2x\le1\\8x>5\end{cases}⇔\begin{cases}x\le\dfrac{1}{2}\\x>\dfrac{5}{8}\end{cases} (\text{vô lý})$
Vậy hệ pt vô nghiệm.
Đáp án:
<,=: có nghĩa là nhỏ hơn hoặc bằng nha
2x-1 <,= 0
-> 2x <,= 1
-> x<,= 1/2
5-8x<0
-> -8x < -5
-> x>5/8
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*CHÚC BẠN HỌC TỐT!
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tính giá trị của biểu thức giúp mình câu C nha ( 50 điểm )
Câu 1: Nội dung chính của phần trích thơ trên là gì? Câu 2: Phân tích tác dụng của một biện pháp nghệ thuật được sử dụng trong hai câu thơ sau: "Tổ Quốc là tiếng mẹ/ Ru ta từ trong nôi" Câu 3: Thông điệp mà tác giả gửi gắm qua phần trích thơ? Bài học rút ra từ thông điệp?
giúp em với,em cho 30điểm ,cần gấp ạ .câu 3c nhé
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Cali : Ngày Quốc Khánh or Vẽ mầm cầm cờ Việt Nam ( tradi hay digi đều được ) + Màu + Có tâm
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