The number of boys is1:a * (1+1/4) = 5a/4.
The number of girls is less than that of boys: (5a/4-a)/(5a/4) = (a/4)/(5a/4) =1/5.
That is, there are fewer girls than boys 1.
The original proposition is wrong, 6. There are more boys than girls 1, and fewer girls than boys1-(true or false)
Correct answer: Wrong.
Analysis: "The number of boys is more than that of girls 1", and the number of girls is 1. Divide the number of girls into four equally. Except for the same number of boys, there are more girls 1, that is, the number of boys is 1+ 1/4 = 5.
"The number of girls is less than that of boys 1", the number of boys is 1, the average number of boys is divided into four, and the number of girls is 1, that is, the number of girls is only ... 3. If the number of boys is more than that of girls 1/4:
Let girls be x people. Male students are (1+ 1/4)x=5x/4. A quarter of the boys are 5x/ 16. A quarter less is 5x/4-5x/16 =15x/16 people. Because x is not equal to 15x/ 16, it is not correct. 2. Boys 1/4 means girls 1/4, and girls 1/4 means boys 1/4. I'll see if I can tell you tomorrow. According to the first sentence, let girls be X and boys be (5/4) X. According to the second sentence, the ratio of (5/4) X minus X.
The number of boys, that is, (5/4)X, is 1/5, so girls are less than boys 1, not 1/4, 1. Let the number of girls be x and the number of boys be X+ 1/4X.
Equation: x+1/4x = (x+1/4x)-1/4 (x+1/4x).
Because X+ 1/4X is not equal to (x+1/4x)-1/4 (x+1/4x).
It is wrong to say, 0, simply assume that there are five boys and four girls. The number of boys is more than that of girls (5-4) ∕ 4 =1∕ 4;
Girls are less than boys (5-4)∕5= 1∕5.
Think about it. This is why sometimes the proposition of the previous question is not necessarily correct. Let me put forward a different point of view:
First of all, this question is not clear about what these two 1/4 are and whose 1/4 are. If boys are 100 and girls are 75, then there are more boys than girls, and girls are less than boys 1/4. , 0, (mathematical judgment question).
There are more boys than girls 1, and fewer girls than boys1-(true or false)
mistake
I know it's wrong, but I can't explain it with mathematical theory.