∵A+B分之1,A的平方-B的平方分之1和B-A分之B的公分母是(A+B)(A-B),
∴1/(A+B)=(A-B)/[(A+B)(A-B)]
1/(A²-B²)=1/[(A+B)(A-B)]
B/(B-A)=-B(A+B)/[(A+B)(A-B)]
X的平方-Y的平方分之1 A+B分之1,A的平方-B的平方分之1和B-A分之B 通分
X的平方-Y的平方分之1 A+B分之1,A的平方-B的平方分之1和B-A分之B 通分
其他人气:239 ℃时间:2020-02-03 23:25:26
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