已知1分之A减1分之B=3，求a-ab-b分之2a+3ab-2b

已知1分之A减1分之B=3，求a-ab-b分之2a+3ab-2b

1/a-1/b=3
兩邊同乘以ab
b-a=3ab
a-b=-3ab
a-ab-b
=a-b-ab
=-3ab-ab
=-4ab
2a+3ab-2b
=2（a-b）+3ab
=-6ab+3ab
=-3ab

Elden Ring Premiere

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