一,计算(1)5a^2b*(-2ab^2)^3 (2)(12x^3y-20xy)/4xy二,化简,求值(m+2n)^2-
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/06 02:07:29
一,计算
(1)5a^2b*(-2ab^2)^3 (2)(12x^3y-20xy)/4xy
二,化简,求值
(m+2n)^2-(m-n)(m+3n),其中m=根号2,n=根号3
(1)5a^2b*(-2ab^2)^3 (2)(12x^3y-20xy)/4xy
二,化简,求值
(m+2n)^2-(m-n)(m+3n),其中m=根号2,n=根号3
(1)5a^2b*(-2ab^2)^3
=5a^2b*(-8)*a^3*b^6
=-40*a^5*b^7
(2)(12x^3y-20xy)/4xy
=12x^3y/4xy -20xy/4xy
=3x^2-5
二.
(m+2n)^2-(m-n)(m+3n)
=(m+2n)^2-(m+n-2n)(m+n+2n)
=(m+2n)^2-(m+n)^2+4n^2
=(m+2n-m-n)(m+2n+m+n)+4n^2
=n*(2m+3n)+4n^2
=21+2√6
还可以吧
=5a^2b*(-8)*a^3*b^6
=-40*a^5*b^7
(2)(12x^3y-20xy)/4xy
=12x^3y/4xy -20xy/4xy
=3x^2-5
二.
(m+2n)^2-(m-n)(m+3n)
=(m+2n)^2-(m+n-2n)(m+n+2n)
=(m+2n)^2-(m+n)^2+4n^2
=(m+2n-m-n)(m+2n+m+n)+4n^2
=n*(2m+3n)+4n^2
=21+2√6
还可以吧
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