已知 m-n=4,mn=-1 .求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 05:39:03
已知m-n=4,mn=-1.求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值已知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
已知 m-n=4,mn=-1 .求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值
已知 m-n=4,mn=-1 .求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值
(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)
=-2mn+2m+3n-3mn-2n+2m-m-4n-mn
=(-2mn-3mn-mn)+(2m+2m-m)+(3n-2n-4n)
=-6mn+3m-3n
=3(m-n-2mn)
原式=3[4-2(-1)]
=3×6=18
应该是这样
原式=-2mn+2m+3n-3mn-2n+2m-m-4n-mn
=(-2mn-3mn-mn)+(2m+2m-m)+(3n-2n-4n)
=-6mn+3m+(-3n)
=-6mn+3m-3n
=-6mn+3(m-n)
m-n=4,mn=-1
原式=-6mn+3(m-n)=-6×(-1)+3×4=18
已知m-n=2,mn=1,求多项式(-2mn+2mn+3n)-(3mn+2n-2m)-(m+4n+mn)的值
已知m-n=2,mn=1,求多项式(-2mn+2mn+3n)-(3mn+2n-2m)-(m+4n+mn)的值
已知m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值.
已知m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值
已知m-n=2,mn=1,求多项式(2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值
已知m-n=3,mn=-1,求多项式-2mn+2m+3n-3mn-2n+2m-4n-m-mn的值
已知m+n=-4 mn=2求mn
已知1/m-1/n=2求m+4mn-n/2m-mn-2n的值
已知m-n=4,mn=2,求多项式(-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值
已知m-n=4,mn=2,求多项式(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值.
已知m-n=3,mn=-3,求(-m-4n-mn)-(2mn-2m-3n)-(3mn+2n-2m)的值
已知m-n=4,m、n互为倒数求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4m+mn)的值
已知m+n=4,mn=1,求2m+3mn+2n的值算式
已知m+n=-2,mn=4,求2(mn-3m)-3(2n-mn)的值.无.
已知m+n=-5,mn=4,求2(mn-3m)-3(2n-mn)
已知:m,n均为实数,且(m+1)(n+1)=4mn,求mn+mn的值
已知m+n=3,mn=2/3,求mn-mn+mn的值
已知m分之一-n分之一=4,求2m-3mn-2n/m-2mn-n的值