【几道数学题不会,帮忙解一下..1.m,n满足|m+2|+根号下n-4=0,分解因式(x2+y2)-(mxy+n)=______2.已知实数x,y满足x2+4xy+4y2-x-2y+1/4=0则x+2y的值为_____3.已知a-2=b+c,则代数式a(a-b-c)-b(a-b-c)+c(b-a+c)的值是_____4.已知】
<p>问题：【几道数学题不会,帮忙解一下..1.m,n满足|m+2|+根号下n-4=0,分解因式(x2+y2)-(mxy+n)=______2.已知实数x,y满足x2+4xy+4y2-x-2y+1/4=0则x+2y的值为_____3.已知a-2=b+c,则代数式a(a-b-c)-b(a-b-c)+c(b-a+c)的值是_____4.已知】<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">韩玉启的回答：<div class="content-b">网友采纳 1.m,n满足|m+2|+根号下n-4=0,分解因式(x2+y2)-(mxy+n)因为绝对值和算术平方根都大于等于0现在相加等于0所以她们都等于0所以m+2=0,n-4=0m=-2,n=4(x2+y2)-(mxy+n)=(x^2+y^2)+2xy-4=(x+y)^2-4=(x+y+2)(x+y-2)2.已知实数...
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