已知m-n=5.mn=-3 求下列-(m+4n-mn)-(2mn-2m-3n)+(2n-2m-3已知m-n=5.mn=-3 求下列-(m+4n-mn)-(2mn-2m-3n)+(2n-2m-3mn) 的值

来源：学生作业帮助网编辑：作业帮时间：2024/10/08 17:46:54

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已知m-n=5.mn=-3 求下列-(m+4n-mn)-(2mn-2m-3n)+(2n-2m-3已知m-n=5.mn=-3 求下列-(m+4n-mn)-(2mn-2m-3n)+(2n-2m-3mn) 的值
已知m-n=5.mn=-3 求下列-(m+4n-mn)-(2mn-2m-3n)+(2n-2m-3
已知m-n=5.mn=-3 求下列-(m+4n-mn)-(2mn-2m-3n)+(2n-2m-3mn) 的值

等于7

-(m+4n-mn)-(2mn-2m-3n)+(2n-2m-3mn)
=-m-4n+mn-2mn+2m+3n+2n-2m-3mn
=-m+n-4mn
=-(m-n)-4mn
m-n=5.mn=-3 代入
原式=-5-4×（-3）
=-5+12
=7

把式子打开得m+4n-mn-2mn+2m+3n+2n-3m-3mn＝9n-4mn由m-n=5，mn=-3，联立m=，n=，再代入

已知m-n=5, mn=-3
-m -4n +mn
2m +3n -2mn
+) -2m +2n -3mn
-------------------------
-m +n -4mn = -(m-n)-4mn= -5 -4*(-3)=7

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