(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,

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(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2这一步怎么推出来的,(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2这一步怎

(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,
(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,
(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,

(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,(x1-x2)+(x2-x1)/(x1x2)=(x1-x2)(x1x2-1)/x1x2 这一步怎么推出来的,
通分
分子=x1x2(x1-x2)-(x1-x2)
=(x1-x2)(x1x2-1)

(x1-x2)+(x2-x1)/(x1x2)
=x1x2(x1-x2)/x1x2+(x2-x1)/(x1x2)
=[x1x2(x1-x2)-(x1-x2)]/x1x2
=(x1-x2)(x1x2-1)/x1x2

(x1-x2)+(x2-x1)/(x1x2)
=[(x1-x2)+(x2-x1)]/(x1x2)
=[(x1x2)(x1-x2)-(x1-x2)]/(x1x2)
=(x1-x2)(x1x2-1)/x1x2

(x1-x2)+(x2-x1)/(x1x2)
=(X1-X2)*[1-1/(X1*X2)]
=(X1-X2)*[(X1*X2-1)/X1*X2]

设x1,x2(x1 已知x1,x2(x1 已知x1、x2（x1 若x1,x2(x1 若x1,x2(x1 若x1,x2(x1 已知x1,x2(x1 x的2次方=2x+1,求下列各值 (1)x1的3次方·x2+x1·x2的3次方 (2)(x1-x2)的2次方 (3)x1分之x2+x2分之x1x的2次方=2x+1,求下列各值(1)x1的3次方·x2+x1·x2的3次方 (2)(x1-x2)的2次方 (3)x1分之x2+x2分之x1 x1、x2∈R,证明|x1|-|x2|≤|x1-x2| 像(x1+x2)(x1-x2)+(x1-x2)怎么因式分解 x2-x1怎么用x1*x2和x1+x2表示? 定义区间[x1,x2](x1 定义：区间[x1,x2]( x1 定义:区间[x1,x2](x1 定义:区间【x1,x2】(x1 定义：区间【x1,x2】(x1 X2/X1(X1+X2)+X3/(X1+X2)(X1+X2+X3)+.Xn/（x1+x2+...Xn-1)(X1+X2...+Xn） X1+1/X1-X2-1/X2 因式分解