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挑战
If \( 16+\frac{1}{4}(7x-6)=\frac{3}{4}(7x-6) \) , what is the value of \( 7x−6 \)?
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一元一次方程与代数求值进阶
\( 0.10x+0.20y=0.18(x+y) \)
This equation represents mixing a volume x, in gallons of a 10% saltwater solution with a volume y , in gallons of a 20% saltwater solution to produce an 18% saltwater solution. According to this equation, what volume, in gallons, of the 20% saltwater solution could be mixed with 45.0 gallons of the 10% saltwater solution to produce an 18% saltwater solution? (Assume that the volume of the mixture is the sum of the volumes of the two solutions before they were mixed.)
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一元一次方程与代数求值挑战
If \( \frac{9x}{2}-11=\frac{45}{2}-11 \), what is the value of \( 9x \)?
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一元一次方程与代数求值进阶
If \( 3+\frac{1-x}{1}=\frac{2(1-x)}{1} \) , what is the value of \( 1−x \)?
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一元一次方程与代数求值进阶
A piece of a metal alloy called delta metal has a total mass of 200.0 grams. The equation \( c+z+3.1=200.0 \) relates the mass of copper c, in grams, and the mass of zinc z, in grams, in this piece of metal. If this piece of metal contains 110.0 grams of copper, how many grams of zinc does it contain?
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一元一次方程与代数求值进阶
\( 40x+36y=720 \)
Tom saved $40 each month for x months, and Karla saved $36 each month for y months. Together, Tom and Karla saved a total of $720. If Tom saved for 9 months, for how many months did Karla save?
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一元一次方程与代数求值进阶
\( \frac{v}{r}-12=2s \)
The given equation relates the positive numbers r, s, and v. Which equation correctly expresses v in terms of r and s?
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一元一次方程与代数求值进阶
\( 11j+9k=m \)
The given equation relates the numbers j, k, and m. Which equation correctly expresses k in terms of j and m?
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一元一次方程与代数求值进阶
If \( \frac{x}{y}=6 \) and\( \frac{7x}{ny} \) \( =6 \), what is the value of n?
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一元一次方程与代数求值基础
If \( 6x=9 \), what is the value of \( 48x \)?
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一元一次方程与代数求值挑战
If \( \frac{x+6}{5}=\frac{x+6}{13} \), the value of \( x+6 \) is between which of the following pairs of values?
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一元一次方程与代数求值挑战
\( R=\frac{0.36ℓ}{A} \)
The given equation relates the resistance R , in ohms, of a wire to its length \( ℓ \), in meters, and its cross-sectional area A , in square meters. Which equation correctly expresses the length, in meters, of the wire in terms of its resistance, in ohms, and its cross-sectional area, in square meters?
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