here+is+the+park改为否定句?

To solve the equation 30x = 900, you need to divide both sides of the equation by 30 to isolate the variable x. 30x = 900 Dividing both sides by 30: x = 900/30 Simplifying: x = 30 So the solution to the equation is x = 30.

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a*b=a×b÷(a+b)+5求21*(80*20)

To evaluate 21*(80*20), we can follow the given equation: a * b = a * b / (a + b) + 5 Let's substitute a = 21 and b = (80 * 20): 21 * (80 * 20) = 21 * (80 * 20) / (21 + (80 * 20)) + 5 Now we can simplify the equation using the order of operations (parentheses first): = 21 * (1600) / (21 + 1600) + 5 Next, we can perform the multiplications and addition inside the parentheses: = 21 * 1600 / 1621 + 5 = 33,600 / 1621 + 5 Now, we can divide 33,600 by 1621: ≈ 20.6986 + 5 Lastly, we add 20.6986 and 5: ≈ 25.6986 Therefore, 21 * (80 * 20) is approximately 25.6986.

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