4+ X + 8 x X= 36
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a: =2008(1+347+752)
=2008*1100
=2208800
b: 125*199*25*8*4
=125*8*25*4*199
=199*1000*100
=199000000
c: =36*(28+45)
=36*73=2628
d: 226*374+277*26
=84524+7202
=91726
`a)2008+2008*347+752*2008`
`=2008*(1+347+752)`
`=2008*1100`
`=2208800`
`125*199*25*8*4`
`=(125*8)*(4*25)*199`
`=1000*100*199`
`=19900000`
`c)226*374+277*26`
`=84524 + 7202`
`=91726`
bn tách ra a, b, c cho dễ nhìn nhé .
7 x 8 = 56 16 : 2 = 8 36 : 6 = 6 49 : 7 = 7
2 x 5 = 10 72 : 8 = 9 9 x 3 = 27 63 : 7 = 9
6 x 4 = 24 25 : 5 = 5 4 x 8 = 32 7 x 5 = 35
7 x 8 = 56
2 x 5 = 10
6 x 4 = 24
16 : 2 = 8
72 : 8 = 9
25 : 5 = 5
36 : 6 = 6
9 x 3 = 27
4 x 8 = 32
49 : 7 = 7
63 : 7 = 9
7 x 5 = 35
Đề bài :
\(\left(x-2\right)\left(x-4\right)\left(x+6\right)\left(x+8\right)=-36\)
\(x=+_-\sqrt{34}-2,\)
\(x=-3\sqrt{2}-2,\)
\(x=3\sqrt{2}-2\)
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x ( 4 x 9 - 36 )
= 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 0
= 0
1x2x3x4x5x6x7x8x(4x9-36)
=1x2x3x4x5x6x7x8x(36-36)
= 1x2x3x4x5x6x7x8x0
= 0
\(\left(x-1\right)\left(x-4\right)\left(x-5\right)\left(x-8\right)+36=0\)
\(\left[\left(x-1\right)\left(x-8\right)\right]\left[\left(x-4\right)\left(x-5\right)\right]+36=0\)
\(\left(x^2-9x+8\right)\left(x^2-9x+20\right)+36=0\)
Đặt \(a=x^2-9x+14\)ta có :
\(\left(a-6\right)\left(a+6\right)+36=0\)
\(a^2-6^2+36=0\)
\(a^2=0\)
Thay \(a=x^2-9x+14\)ta có :
\(\left(x^2-9x+14\right)^2=0\)
\(\Leftrightarrow x^2-9x+14=0\)
\(\Leftrightarrow x^2-2x-7x+14=0\)
\(\Leftrightarrow x\left(x-2\right)-7\left(x-2\right)=0\)
\(\Leftrightarrow\left(x-2\right)\left(x-7\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-2=0\\x-7=0\end{cases}\Rightarrow\orbr{\begin{cases}x=2\\x=7\end{cases}}}\)
Vậy,...........
\(\left(x-1\right)\left(x-4\right)\left(x-5\right)\left(x-8\right)+36=0\)
\(\Rightarrow\left(x-1\right)\left(x-8\right)\left(x-4\right)\left(x-5\right)+36=0\)
\(\Leftrightarrow\left(x^2-8x-x+8\right)\left(x^2-4x-5x+20\right)+36=0\)
\(\Rightarrow\left(x^2-9x+8\right)\left(x^2-9x+20\right)+36=0\)
\(\Rightarrow\left(x^2-9x+14-6\right)\left(x^2-9x+14+6\right)+36=0\)
\(\Rightarrow\left(x^2-9x+14\right)^2-36+36=0\)
\(\Rightarrow x^2-9x+14=0\Leftrightarrow\left(x-2\right)\left(x-7\right)=0\Leftrightarrow\left[{}\begin{matrix}x=2\\x=7\end{matrix}\right.\)
56 . Tính nhanh :
a ) 2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3
b ) 36 x 28 + 36 x 82 + 64 x 69 + 64 x 41
a) 2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3
= 24 x 31 + 24 x 42 + 24 x 27
= 21 x ( 31 + 42 + 27)
= 21 x 100
= 2100
b) 36 x 28 + 36 x 82 + 64 x 69 + 64 x 41
= 36 x ( 28 + 82) + 64 x ( 69 + 41)
= 36 x 110 + 64 x 110
= 110 x ( 36 + 64)
= 110 x 100
= 11000
A = 8 x 9 x 10 + 6 x 25 x 12 + 4 x 18 x 66 - 2 x 36
A = (8 x 9) x 10 + (6 x 12) x 25 + (4 x 18) x 66 - 2 x 36
A = 72 x 10 + 72 x 25 + 72 x 66 - 72
A = 72 x ( 10 + 25 + 66 - 1)
A = 72 x 100
A = 7200
4 + X + 8 x X = 36
X + 8 x X = 36 - 4
X + 8 x x = 32
X x ( 1 + 8) = 32
X x 9 = 32
X = 32: 9
X = \(\dfrac{32}{9}\)
(4+8) x X = 36
12 x X= 36
X= 36:12=3