当x=0.25,y=1.4时,3x-0.42的值是(),8xy+y的值是()
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当x=0.25,y=1.4时,3x-0.42的值是(),8xy+y的值是()
当x=0.25,y=1.4时,3x-0.42的值是(),8xy+y的值是()
当x=0.25,y=1.4时,3x-0.42的值是(),8xy+y的值是()
当x=0.25,y=1.4时,3x-0.42的值是(0.33 ),8xy+y的值是(4.2)
直接代入- -
3X-0.42=0.75-0.42=0.33
8XY+Y=2*1.4+1.4
=3*1.4=4.2