『数学题』新加坡的数学题,超难!1）In a farm,there are cows and chickens which have a total of 86 eye and 142 legs.How many cows and chickens are there?2)A weightlifter puts one large and one small iron disc on each side of a lifting roa

『数学题』新加坡的数学题,超难!1）In a farm,there are cows and chickens which have a total of 86 eye and 142 legs.How many cows and chickens are there?2)A weightlifter puts one large and one small iron disc on each side of a lifting roa
『数学题』新加坡的数学题,超难!
1）In a farm,there are cows and chickens which have a total of 86 eye and 142 legs.How many cows and chickens are there?
2)A weightlifter puts one large and one small iron disc on each side of a lifting road which,by itself,weighs 6kg.Now the total mass is 150kg.Then he adds one more small iron disc on each side and yjis time,it weighs 202kg.What is the mass of each of the large and small iron disc?
必须写出method 和算法,普通算式是不被接受的,知道者请快速回答,
ps:
2)第三行，写错字，each side and this time.

『数学题』新加坡的数学题,超难!1）In a farm,there are cows and chickens which have a total of 86 eye and 142 legs.How many cows and chickens are there?2)A weightlifter puts one large and one small iron disc on each side of a lifting roa
第一题：
牛2眼4腿,鸡2眼2腿
总共86眼 142腿~~
设鸡X 牛Y则 2X+2Y=86 2X+4Y=142
解得X=15 Y=28
第二题：
设large iron重X kg small iron重 Y kg
由这句 puts one large and one small iron disc on each side of a lifting road which,by itself,weighs 6kg.Now the total mass is 150kg
得2X+2Y+6=150
由这句 he adds one more small iron disc on each side and yjis time, it weighs 202kg
得4X+2Y+6=202
解得X=26 Y=46
什么有点难,国内小学生做的题都比这难~~~
顺便说一句,这单词什么意思?yjis?

15 chickens and 28 cows.

1)cows=(142-86)/2=28
chickens=(86-28*2)/2=15

1)设有x只牛（cow），y只鸡（chicken)
2x+2y=86 x=28
{ （解方程组略）{
4x+2y=142 y=15
答：有28只牛，15只鸡。
第2题看不懂，抱歉～

1:设鸡有x只，牛y只
2x+4y=142
2x+2y=86
x=15
y=28
so there are 15 chickens and 28 cows.
2:

江中惠答完了。。我借用下。。
第一题：
牛2眼4腿，鸡2眼2腿
总共86眼 142腿~~
设鸡X 牛Y则 2X+2Y=86 2X+4Y=142
解得X=15 Y=28
第二题：
设large iron重X kg small iron重 Y kg
由这句 puts one large and one smal...

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江中惠答完了。。我借用下。。
第一题：
牛2眼4腿，鸡2眼2腿
总共86眼 142腿~~
设鸡X 牛Y则 2X+2Y=86 2X+4Y=142
解得X=15 Y=28
第二题：
设large iron重X kg small iron重 Y kg
由这句 puts one large and one small iron disc on each side of a lifting road which,by itself,weighs 6kg.Now the total mass is 150kg
得2X+2Y+6=150
由这句 he adds one more small iron disc on each side and yjis time, it weighs 202kg
得4X+2Y+6=202
解得X=26 Y=46

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