a²-ab-b²=﹣3/4,a²-ab+2b²=2/3,求b

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a²-ab-b²=﹣3/4,a²-ab+2b²=2/3,求b

a²-ab-b²=﹣3/4,a²-ab+2b²=2/3,求b
a²-ab-b²=﹣3/4,a²-ab+2b²=2/3,求b

a²-ab-b²=﹣3/4,a²-ab+2b²=2/3,求b
a²-ab-b²=﹣3/4,(1)
a²-ab+2b²=2/3 (2)
(2)-(1)
3b²=(3/4)+(2/3)=17/12
b=±√17/6

a²-ab-b²=﹣3/4,
a²-ab+2b²=2/3,
3b²=17/12
b²=17/36
b=±√17/6