-X/(X+3)(X-5)=A/(X+3)+B/(X-5) 求A B 的值 初二分式内容-X+13/(X+3)(X-5)=A/(X+3)+B/(X-5) 求A B 的值 初二分式内容
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-X/(X+3)(X-5)=A/(X+3)+B/(X-5)求AB的值初二分式内容-X+13/(X+3)(X-5)=A/(X+3)+B/(X-5)求AB的值初二分式内容-X/(X+3)(X-5)=A/(
-X/(X+3)(X-5)=A/(X+3)+B/(X-5) 求A B 的值 初二分式内容-X+13/(X+3)(X-5)=A/(X+3)+B/(X-5) 求A B 的值 初二分式内容
-X/(X+3)(X-5)=A/(X+3)+B/(X-5) 求A B 的值 初二分式内容
-X+13/(X+3)(X-5)=A/(X+3)+B/(X-5) 求A B 的值 初二分式内容
-X/(X+3)(X-5)=A/(X+3)+B/(X-5) 求A B 的值 初二分式内容-X+13/(X+3)(X-5)=A/(X+3)+B/(X-5) 求A B 的值 初二分式内容
右边通分
=[A(X-5)+B(X+3)]/(X+3)(X-5)
=[(A+B)X+(3B-5A)]/(X+3)(X-5)
=(-X+13)/(X+3)(X-5)
所以(A+B)X+(3B-5A)=-X+13
则
A+B=-1
3B-5A=13
解得A=1,B=-2
A = -2 B = 1
将等式通分后可得：（-X+13）/(X+3)(X-5)=[(A+B)X+(3B-5A)]/(X+3)(X-5)
由此可得：A+B=-1
3B-5A=13
解得：A=-2，B=1
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*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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