5272道题目5525 条题源记录 · 相同内容已合并
一元一次方程与代数求值进阶
The equation \( x+y=1,440 \) represents the number of minutes of daylight (between sunrise and sunset), x, and the number of minutes of non-daylight, y, on a particular day in Des Moines, Iowa. If this day has 840 minutes of daylight, how many minutes of non-daylight does it have?
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一元一次方程与代数求值进阶
If \( \frac{x}{9}=5 \), what is the value of \( \frac{9}{x} \) ?
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一元一次方程与代数求值挑战
If \( \left(\frac{1}{2}x-\frac{41}{2}\right)^2-64=0 \), what is the value of \( (x-41)^2 \) ?
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一元一次方程与代数求值挑战
Javier deposits $45 in a savings account at the end of each week. At the beginning of the 1st week of a year there was $900 in that savings account. How much money, in dollars, will be in the account at the end of the 4th week of the year?
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一元一次方程与代数求值进阶
\( a=\frac{3}{11}b+6 \)
The given equation relates the positive numbers a and b. Which equation correctly expresses b in terms of a?
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一元一次方程与代数求值进阶
If 9x+4=32, what is the value of 3(9x+4)?
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一元一次方程与代数求值挑战
The equation \( h=\frac{9(v−273.15)}{5}+32 \) gives the corresponding temperature h, in degrees Fahrenheit, of any substance that has a temperature of v kelvins, where v>0. If a substance has a temperature of 557.33 degrees Fahrenheit, what is the corresponding temperature, in kelvins, of this substance?
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一元一次方程与代数求值挑战
If x-2=3, what is the value of 3(x-2)?
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一元一次方程与代数求值挑战
If a=3k+5r and b=9k-12r+6, which expression is equivalent to a-b?
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一元一次方程与代数求值进阶
\( b-19=\frac{x}{y} \)
The given equation relates the positive numbers b, x, and y. Which equation correctly expresses x in terms of b and y?
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一元一次方程与代数求值进阶
The length of a rectangle is 35 centimeters greater than its width. Which equation gives the area A, in square centimeters, of the rectangle in terms of the width w, in centimeters, of the rectangle?
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一元一次方程与代数求值进阶
During hibernation, American black bears do not eat or replenish calories. A certain black bear weighed 515 pounds when entering hibernation and lost weight at a rate of 0.5 pound per day. At this rate, how many days after entering hibernation did the black bear weigh 490 pounds?
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