试说明代数式3/4x^3y^4-1/2x^2y+y^2-5/4x^3y^4+0.5x^2y+1/2x^3y^4-2y+3
试说明代数式3/4x^3y^4-1/2x^2y+y^2-5/4x^3y^4+0.5x^2y+1/2x^3y^4-2y+3的值与字母
试说明代数式3/4x^3y^4-1/2x^2y+y^2-5/4x^3y^4+0.5x^2y+1/2x^3y^4-2y+3的值与字母
x的取值无关
试说明代数式3/4x^3y^4-1/2x^2y+y^2-5/4x^3y^4+0.5x^2y+1/2x^3y^4-2y+3的值与字母
x的取值无关
赞 stanleyjia 幼苗
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3/4x^3y^4-1/2x^2y+y^2-5/4x^3y^4+0.5x^2y+1/2x^3y^4-2y+3
=3/4x^3y^4-5/4x^3y^4+1/2x^3y^4+0.5x^2y-1/2x^2y+y^2-2y+3
=(3/4-5/4+1/2)x^3y^4+(0.5-1/2)x^2y+y^2-2y+3
=(-1/2+1/2)x^3y^4+(1/2-1/2)x^2y+y^2-2y+3
=y^2-2y+3
所以代数式的值与字母x的取值无关
=3/4x^3y^4-5/4x^3y^4+1/2x^3y^4+0.5x^2y-1/2x^2y+y^2-2y+3
=(3/4-5/4+1/2)x^3y^4+(0.5-1/2)x^2y+y^2-2y+3
=(-1/2+1/2)x^3y^4+(1/2-1/2)x^2y+y^2-2y+3
=y^2-2y+3
所以代数式的值与字母x的取值无关
1年前
10
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你能帮帮他们吗