xy^2-5x^2y+1/2xy^2+2/3x^y
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/18 16:37:44
xy^2-5x^2y+1/2xy^2+2/3x^y
原式=xy²+1/2xy²-5x²y+2/3x²y
=3/2xy²-13/3x²y
再问: 23a^2bc+10abc^2-15abc^2+2a^2bc+abc^
再答: 原式=23a^2bc+2a^2bc+10abc^2+abc^2-15abc^2 =25a^2bc-4abc^2
再问: 先化简再求值by^2-12y-3+10y-2-by^2,其中y=-5/6
再答: 原式=-12y+10y-3-2 =-2y-5 y=-5/6 原式=-2×(-5/6)-5 =5/3-15/3 =-10/3
再问: 4a^4-2ab^3+6ab^3-3a^4,其中a=3,b=-2
再答: 原式=a^4+4ab^3 =a(a^3+4b^3) a=3,b=-2 原式=3×(27-32)=-15 另外请不要追问了,题目的处理请随意!
=3/2xy²-13/3x²y
再问: 23a^2bc+10abc^2-15abc^2+2a^2bc+abc^
再答: 原式=23a^2bc+2a^2bc+10abc^2+abc^2-15abc^2 =25a^2bc-4abc^2
再问: 先化简再求值by^2-12y-3+10y-2-by^2,其中y=-5/6
再答: 原式=-12y+10y-3-2 =-2y-5 y=-5/6 原式=-2×(-5/6)-5 =5/3-15/3 =-10/3
再问: 4a^4-2ab^3+6ab^3-3a^4,其中a=3,b=-2
再答: 原式=a^4+4ab^3 =a(a^3+4b^3) a=3,b=-2 原式=3×(27-32)=-15 另外请不要追问了,题目的处理请随意!
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