1 Solution: Assume that X people are needed to process the shaft and Y people are needed to process the bearing.
X+Y= 180。
15X= 12Y
X=80,Y= 100。
Answer: It takes 80 people to process the shaft and 100 people to process the bearing.
2 Solution: We buy 65438+X in 0 yuan and Y in 0.5 yuan.
Then X+0.5Y=30 and X+Y=40.
X=20,Y=20。
A: 20 pieces of each.
3 solution: let a number be x and b number be y.
Then 2X+3Y=25 and X/2-Y/3=3.
2X-4Y/3= 12
The solution is X=8 and Y=3.
A: The number A is 8 and the number B is 3.
Solution 4: Suppose there are X male athletes and Y female athletes.
Then X+ 1=Y, 1500X+800Y= 10000.
The solution is X=4 and Y=5.
A: There are four male athletes and five female athletes.
Second, because |x-3y|≥0, |2x-y-5|≥0.
And |x-3y|+|2x-y-5|=0.
So x-3y=0, 2x-y-5=0.
X=3,y= 1。
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