先化简 后求值:(6x²y+3xy²+4)-2(-x²y-4xy²+1),其中|x-½|+(y+3)²=0
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![先化简 后求值:(6x²y+3xy²+4)-2(-x²y-4xy²+1),其中|x-½|+(y+3)²=0](/uploads/image/z/4326897-57-7.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80+%E5%90%8E%E6%B1%82%E5%80%BC%EF%BC%9A%EF%BC%886x%26%23178%3By%2B3xy%26%23178%3B%2B4%EF%BC%89-2%EF%BC%88-x%26%23178%3By-4xy%26%23178%3B%2B1%EF%BC%89%2C%E5%85%B6%E4%B8%AD%7Cx-%26%23189%3B%7C%2B%EF%BC%88y%2B3%EF%BC%89%26%23178%3B%3D0)
先化简 后求值:(6x²y+3xy²+4)-2(-x²y-4xy²+1),其中|x-½|+(y+3)²=0
先化简 后求值:(6x²y+3xy²+4)-2(-x²y-4xy²+1),其中|x-½|+(y+3)²=0
先化简 后求值:(6x²y+3xy²+4)-2(-x²y-4xy²+1),其中|x-½|+(y+3)²=0
化简:8x²y+11xy²+2
∵绝对值和平方具有非负性
|x-½|≥0 (y+3)²≥0∴X=1/2 Y=-3
当x=1/2,y=-3时
代数式=2+49.5+2
=53.5