(1)若/x-2/+x²-xy+1/4y²=0,求2x-3y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.
答
(1)若/x-2/+x²-xy+1/4y²=0,求2x-3y的值.∵|x-2|+(x-y/2)^2+0∴x-2=0,x-y/2=0∴x=2,y=4∴2x-3y=2*2-3*4=8(2)如果(a²+b²)(a²+b²-10)+25=0,求a²+b²的值解令a²+b&...