a gallon of milk costs y cents.
2 half gallons cost 2x cents.
a gallon costs z cents less than 2 half-gallons,therefore:
y=2x-z
移項(xiàng),D正確.
注：一加侖花的錢(qián)不一定是半個(gè)加侖的兩倍（這就好比我們買(mǎi)大包的薯片一般單位凈重的單價(jià)會(huì)便宜一樣）
SAT問(wèn)題：Milk costs x cents per half-gallon and y cents per gallon. If a gallon of milk costs z c
SAT問(wèn)題：Milk costs x cents per half-gallon and y cents per gallon. If a gallon of milk costs z c
Milk costs x cents per half-gallon and y cents per gallon. If a gallon of milk costs z cents less than 2 half-gallons, which of the following equations must be true?
A. x – 2y + z = 0
B. 2x – y + z = 0
C. x – y – z = 0
D. 2x – y – z = 0
E. x + 2y – z = 0
which is right?
Milk costs x cents per half-gallon and y cents per gallon. If a gallon of milk costs z cents less than 2 half-gallons, which of the following equations must be true?
A. x – 2y + z = 0
B. 2x – y + z = 0
C. x – y – z = 0
D. 2x – y – z = 0
E. x + 2y – z = 0
which is right?
其他人氣：268 ℃時(shí)間：2020-08-26 19:13:25
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