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           ☆方程1题

〖 1/1方程〗
    作业:求方程 10000 = X-((X/(1+1%)-(X/(1+1%)*1%*7%*50%))*20%*80%)-(X/(1+1%)*1%)-(X/(1+1%)*1%*7%*50%) 的解.
    题型:方程
    解:原方程:
     10000 = X (( X ÷ (1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)) ×
20
100
×
80
100
)( X ÷ (1 +
1
100
) ×
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)
    去掉方程右边的一个括号:
     10000 = X ( X ÷ (1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)) ×
20
100
×
80
100
( X ÷ (1 +
1
100
) ×
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)
    方程化简为:
     10000 = X ( X ÷ (1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)) ×
4
25
( X ÷ (1 +
1
100
) ×
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)
    去掉方程右边的一个括号:
     10000 = X X ÷ (1 +
1
100
) ×
4
25
+ ( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
) ×
4
25
( X ÷ (1 +
1
100
) ×
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)
     方程两边同时乘以:(1 +
1
100
)
     10000(1 +
1
100
) = X (1 +
1
100
) X ×
4
25
+ ( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
) ×
4
25
(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)(1 +
1
100
)
    去掉方程左边的一个括号:
     10000 × 1 + 10000 ×
1
100
= X (1 +
1
100
) X ×
4
25
+ ( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
) ×
4
25
(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)(1 +
1
100
)
    去掉方程右边的一个括号:
     10000 × 1 + 10000 ×
1
100
= X × 1 + X ×
1
100
X ×
4
25
+ ( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
) ×
4
25
(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)
    方程化简为:
     10000 + 100 = X × 1 + X ×
1
100
X ×
4
25
+ ( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
) ×
4
25
(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)
    方程化简为:
     10100 =
17
20
X + ( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
) ×
4
25
(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)(1 +
1
100
)
    去掉方程右边的一个括号:
     10100 =
17
20
X + X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
×
4
25
(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)
    方程化简为:
     10100 =
17
20
X + X ÷ (1 +
1
100
) ×
7
125000
(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)(1 +
1
100
)
     方程两边同时乘以:(1 +
1
100
)
     10100(1 +
1
100
) =
17
20
X (1 +
1
100
) + X ×
7
125000
(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)(1 +
1
100
)(1 +
1
100
)
    去掉方程左边的一个括号:

     10100 × 1 + 10100 ×
1
100
=
17
20
X (1 +
1
100
) + X ×
7
125000
(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)(1 +
1
100
)(1 +
1
100
)
    去掉方程右边的一个括号:
     10100 × 1 + 10100 ×
1
100
=
17
20
X × 1 +
17
20
X ×
1
100
+ X ×
7
125000
(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)(1 +
1
100
)
    方程化简为:
     10100 + 101 =
17
20
X +
17
2000
X + X ×
7
125000
(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)(1 +
1
100
)
    方程化简为:
     10201 =
1717
2000
X + X ×
7
125000
(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)(1 +
1
100
)(1 +
1
100
)
    去掉方程右边的一个括号:
     10201 =
1717
2000
X + X ×
7
125000
× 1 + X ×
7
125000
×
1
100
( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)
    方程化简为:
     10201 =
1717
2000
X + X ×
7
125000
+ X ×
7
12500000
( X ÷ (1 +
1
100
) ×
1
100
)(1 +
1
100
)(1 +
1
100
)( X ÷ (1 +
1
100
) ×
1
100
×
7
100
×
50
100
)(1 +
1
100
)(1 +
1
100
)


    
        X≈12028.019331 ,保留6位小数
    
    有 1个解。


解一元一次方程的详细方法请参阅:《一元一次方程的解法》





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