Question

求未知数X 解方程 小学数学题目





Answer 1

上面一题等式两边都乘以48。下面第一题除换成乘以1/(x-0.45)，小数再换成分数。下面第二题17-x=7,x=10

追问

能详细点吗

追答

1/3 X -5/16 X 8/15 = 2/3
1/3 X -5/16 X 8/15 = 2/3
1/3 X -1/6 = 2/3
1/3 X = 2/3+1/6
1/3 X = 5/6
X = 5/2

8/5 X 1/(X - 0.45) = 16/5
8/(X - 0.45)= 16
1/(X - 0.45)= 2
2 X(X - 0.45) =1
X=1/2 + 0.45
X=0.95 或 19/20

17-x=35/5
17-x=7

x=10

追问

x-4分之3x=5分之3 怎么写

追答

3x/（x-4）= 3/5
先把两边分子的3约掉，然后交叉相乘
x/（x-4）= 1/5
5x = x-4
4x = -4
x = -1

Answer 2

﹙1÷3﹚x－﹙5÷16﹚×﹙8÷15﹚＝2÷3
﹙1÷3﹚x﹣1÷6﹣2÷3＝0
x＝2