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d: \(D=x^3-6x^2+12x-100\)
\(=x^3-6x^2+12x-8-92\)
\(=\left(x-2\right)^3-92\)
Khi x=-98 thì \(D=\left(-98-2\right)^3-92=-1000000-92=-1000092\)
e: \(E=\left(x+1\right)^3+6\left(x+1\right)^2+12x+20\)
\(=\left(x+1\right)^3+6\left(x+1\right)^2+12\left(x+1\right)+8\)
\(=\left(x+1+2\right)^3\)
\(=\left(x+3\right)^3\)
Khi x=5 thì \(E=\left(5+3\right)^3=8^3=512\)
f: \(F=\left(2x-1\right)\left(4x^2+2x+1\right)-7\left(x^3+1\right)\)
\(=\left(2x\right)^3-1^3-7x^3-7\)
\(=x^3-8\)
Khi x=-1/2 thì \(F=\left(-\dfrac{1}{2}\right)^3-8=-\dfrac{1}{8}-8=-\dfrac{65}{8}\)
g: \(G=\left(-x-2\right)^3+\left(2x-4\right)\left(x^2+2x+4\right)-x^2\left(x-6\right)\)
\(=-\left(x+2\right)^3+2\left(x-2\right)\left(x^2+2x+4\right)-x^3+6x^2\)
\(=-x^3-6x^2-12x-8+2\left(x^3-8\right)-x^3+6x^2\)
\(=-2x^3-12x-8+2x^3-16=-12x-24\)
Khi x=-2 thì \(G=-12\cdot\left(-2\right)-24=24-24=0\)
h: \(H=\left(x-1\right)^3-\left(x+2\right)\left(x^2-2x+4\right)+3\left(x+4\right)\left(x-4\right)\)
\(=x^3-3x^2+3x-1-\left(x^3+8\right)+3\left(x^2-16\right)\)
\(=x^3-3x^2+3x-1-x^3-8+3x^2-48\)
\(=3x-57\)
Khi x=-1/2 thì \(H=3\cdot\dfrac{-1}{2}-57=-1,5-57=-58,5\)
\(1.\) 12 x 11 + 21 x 11 x 11 + 11 x 33
= ( 12 x 11 ) + ( 21 x 11 x 11 ) + ( 11 x 33 )
= \(132+2541+363\)
= \(3036\)
132x11-11x32-54x11
= ( 132 x 11 ) - ( 11 x 32 ) - ( 54 x 11 )
\(=1452-352-594\)
= \(506\)
\(2.\)
45 x 32 + 1245
= ( 45 x 32 ) + 1245
= 1400 + 1245
= 2685
75 x 18 + 75 x 21
= ( 75 x 18 ) + ( 75 x 21 )
= 1350 + 1575
= 2925
12 x (27+46) -1567
= 12 x 73 - 1567
= ( 12 x 73 ) - 1567
= 876 - 1567
= - 691
Câu 1:
= 10 x 10 + ( 24-x)/4
Câu 2:
Bảng tính nào?
Câu 3:
20 x a^2/16
a. = 12 + -12 + [-24]
=0+[-24]
=-24
b. = 23 + -23 + 23
=0+23
=23
cho mik nhé
hok tốt
hihi
`A = |6 : 3/5 - 1 1/6 . 6/7| : |4 1/5 . 10/11 + 5 2/11|`
`=|10 - 1| : |42/11 + 57/11|`
`=9 : 9`
`=1`
P = (\(\dfrac{13}{84}\) x 1\(\dfrac{2}{5}\) - 2\(\dfrac{1}{2}\) x \(\dfrac{7}{180}\)) : 2\(\dfrac{7}{18}\) + 4\(\dfrac{1}{2}\) x \(\dfrac{1}{10}\)
P = (\(\dfrac{13}{84}\) x \(\dfrac{7}{5}\) - \(\dfrac{5}{2}\) x \(\dfrac{7}{180}\)):\(\dfrac{43}{18}\) + \(\dfrac{9}{2}\) x \(\dfrac{1}{10}\)
P = (\(\dfrac{13}{60}\) - \(\dfrac{7}{72}\)): \(\dfrac{43}{18}\) + \(\dfrac{9}{20}\)
P = \(\dfrac{43}{360}\) x \(\dfrac{18}{43}\) + \(\dfrac{9}{20}\)
P = \(\dfrac{1}{20}\) + \(\dfrac{9}{20}\)
P = \(\dfrac{10}{20}\)
P = \(\dfrac{1}{2}\)
`7/19*8/11-7/19*(-3)/11+12/19`
`=7/19*(8/11-(-3)/11)+12/19`
`=7/19*1+12/19`
`=7/19+12/19`
`=19/19=1`
Ta có : 2x2!=(3-1)x2! 3x3!=(4-1)x4! .................... 100x100!=(101-1)x100! biểu thức có kết quả là -1+101!