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lethinhanhoa
2 năm trước
Một người đi taxi phải trả 18 000 đồng cho 1 km trong 10 km đầu tiên. Khi hành trình vượt quá 10 km phải trả 25 000 đồng cho mỗi km kế tiếp. Hãy viết biểu thức biểu diễn số tiền người đó phải trả khi đi x km(với x>10 km, x là số nguyên) .Tính số tiền người đó phải trả khi đi 30 km
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