8x-4xy+5y/y-7, при х=-2,5, у=3

Question

8x-4xy+5y/y-7, при х=-2,5, у=3

Answer 1

-12.5+30+15/(-4)
-25/2+30+15/(-4)
55/4
13.75

Comments

х и -х, при х=3; х=0; х=-5

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Answer 2

Подставим 
[8*(-2,5)-4*(-2.5)*3+5*3]/3-7

[-20+30+15]/-4 = [25]/-4 =- [25]/4 = - 6.25

Comments

х и -х, при х=3; х=0; х=-5