[Toán 7] VIolympic vòng 13

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maimaivuive

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nguyenbahiep1

1] Cho f(x)=[TEX]\frac{5}{x} [/TEX]; g(x)=-4x;[TEX] h(x)=x^2+3[/TEX]
Khi đó f(-1) - 2g(3) + h(0) =

[laTEX]f(-1) = - 5 , g(3) = -12 , h(0) = 3 \Rightarrow f(-1) - 2g(3) + h(0) = -5 +24+3 = 22[/laTEX]
 
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thangvegeta1604

1) f(-1)=$\dfrac{-5}{1}$=-5.
g(3)=-4.3=-12\Rightarrow 2g(3)=2.-12=-24
h(0)=$0^2$+3=0+3=3.
Vậy f(-1)-2g(3)+h(0)=(-5)-(-24)+3=(-5)+24+3=22
 
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