(1)若/x-2/+x²-xy+1/4y²=0,求2x-3y的值.(2)如果(a²+b²)(a²+b²-10)+25=0,求a²+b²的值.

问题描述:

(1)若/x-2/+x²-xy+1/4y²=0,求2x-3y的值.
(2)如果(a²+b²)(a²+b²-10)+25=0,求a²+b²的值.