问题
解答题
已知m,x,y满足条件:(1)
|
答案
因为(x-5)2,|m|都是非负数,
所以由(1)可得:x=5,m=0,
由(2)得y+1=3,所以y=2.
下面先化简所求代数式,然后再代入求值.
0.375x2y+5m2x-{-
x2y+[-7 16
xy2+(-1 4
x2y-3.475xy2)-6.275xy2]}3 16
=0.375x2y+5m2x+
x2y+7 16
xy2+1 4
x2y+3.475xy2+6.275xy23 16
=x2y+5m2x+10xy2
=52×2+0+10×5×22
=250.