1.8m^2-9[4mn+m^2-3(2m^2+mn)]+(-10m^2-2mn)=?2.1/4a^2b^2[3ab(a+b)-5a(ab-b^2)]
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1.8m^2-9[4mn+m^2-3(2m^2+mn)]+(-10m^2-2mn)=?2.1/4a^2b^2[3ab(a+b)-5a(ab-b^2)]
1.8m^2-9[4mn+m^2-3(2m^2+mn)]+(-10m^2-2mn)=?2.1/4a^2b^2[3ab(a+b)-5a(ab-b^2)]
1.8m^2-9[4mn+m^2-3(2m^2+mn)]+(-10m^2-2mn)=?2.1/4a^2b^2[3ab(a+b)-5a(ab-b^2)]
1. 8m^2-9[4mn+m^2-3(2m^2+mn)]+(-10m^2-2mn)
=8m²-36mn-9m²+54m²+27mn-10m²-2mn
=43m²-11mn
2. 1/4a^2b^2[3ab(a+b)-5a(ab-b^2)]
=a²b²/4(3a²b+3ab²-5a²b+5ab²)
=-a^4b³/2+2a³b^4
1、原式=8m²-9(mn+5m²)-10m²-2mn
=(8+45-10)m²-(9+2)mn
=43m²-11mn
2、原式=1/4a²b²(3a²b+3ab²-5a²b+5ab²)
=1/4a²b² (8ab²-2a²b)
=(b-a)/2ab
若m-n=4,mn=-1求(9-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)
因式分解m^3-2m^2n+mn^2-4m^2+4mn+4m
3(m^2n+mn)-4(mn-2m^2n)+mn.要有过程
3(m^2+mn)-4(mn-2m^2n)+mn
先化简,再求值(3M-5M+4MN)-(2M-4N+6MN)
(5mn-2m+3n)+(-7m-7mn)
(5mn-2m+3n)+(-7m-7mn)
已知m-n=4,m、n互为倒数求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4m+mn)的值
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已知m-n=3,mn=-3,求(-m-4n-mn)-(2mn-2m-3n)-(3mn+2n-2m)的值
已知m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值.
若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)
已知m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值