Đáp án:
Giải thích các bước giải:
+) Với `x=-1`
`=>x^2-5x=(-1)^2-5.(-1)=1+5=6`
+) Với `x=1/2`
`=>x^2-5x=(1/2)^2-5.(1/2)=1/4-5/2=-9/4`
Tại `x = 1`
`-> x^2 - 5x = 1^2 - 5 . 1 = 1 - 5 = -4`
Tại `x =-1`
`-> x^2 -5x = (-1)^2 - 5 . (-1) = 1 +5 =6`
Tại `x =1/2`
`-> x^2 -5x = (1/2)^2 - 5 . (1/2) = 1/4 - 5/2 = 1/4 - 10/4 =-9/4`
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