設(shè)答對(duì)x道題,答錯(cuò)25-x
4x-2(25-x)=88
6x=138
x= 23
答對(duì)一題得4分.不答或答錯(cuò)扣2分,某同學(xué)參加比賽得了88分,他需要答對(duì)幾道題
答對(duì)一題得4分.不答或答錯(cuò)扣2分,某同學(xué)參加比賽得了88分,他需要答對(duì)幾道題
數(shù)學(xué)人氣：261 ℃時(shí)間：2020-05-27 21:59:23
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