Х + 11,5 = 10,5
х = 10,5 - 11,5
х= - (11,5 - 10,5)
х = - 1
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- 1 + 11,5 = 10,5
10,5 = 10,5
5 + 3х = 8
3х = 8 - 5
3х =3
х= 3: 3
х= 1
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5 + 3*1 = 8
5 + 3 = 8
8=8
6х + 7 - 2х = 3
(6-2) *х = 3 - 7
4х = - 4
х =(-4) : 4
х =-1
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6*(-1) + 7 - 2*(-1)= 3
- 6 + 7 + 2 = 3
9 - 6 = 3
3 = 3
4 : х = 2 : 2,5
2*х = 4*2,5
2х= 10
х = 10 : 2
х = 5
============
4: 5 = 2: 2,5
0,8=0,8
F(x)=2x²+1В точке x0 =-1, если Δx=0,1
Δf(x)=f(x₀+Δx)-f(x<span>₀)
</span>f(x₀+Δx)=2(x₀+Δx)²=2(x₀²+2x₀Δx+Δx²)+1=2x₀²+4x₀Δx+2Δx<span>²+1
f(x</span>₀)=2x₀<span>²+1
</span>Δf(x)=2x₀²+4x₀Δx+2Δx²+1-2x₀²-1=4x₀Δx+2Δx<span>²
</span>Δf(x₀)=<span>Δf(-1)=4</span><span>·(-1)</span><span>·0,1+2</span><span>·0,1</span><span>²=-0,4+2</span><span>·0,01=-0,4+0,02=-0,38</span>