先化简,在求值:6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y 其中|x+3|+(y-1\
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/06/02 09:58:50
先化简,在求值:6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y 其中|x+3|+(y-1\2)^2=0
|x+3|+(y-1/2)^2=0
|x+3|=0,(y-1/2)^2=0
x=-3
y=1/2
6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y
=6x^2y-6x^2y +2xy-5yx-3x^2y^2-4y^2x^2-7x
=-3xy-7x^2y^2-7x
=-3*(-3)*1/2-7*(-3)^2*(1/2)^2-7*(-3)
=9/2-63/4+21
=39/4
|x+3|=0,(y-1/2)^2=0
x=-3
y=1/2
6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y
=6x^2y-6x^2y +2xy-5yx-3x^2y^2-4y^2x^2-7x
=-3xy-7x^2y^2-7x
=-3*(-3)*1/2-7*(-3)^2*(1/2)^2-7*(-3)
=9/2-63/4+21
=39/4
先化简,在求值:6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y 其中|x+3|+(y-1\
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