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\(a,-\frac{9}{12}=-\frac{9:3}{12:3}=-\frac{3}{4}\)
\(\frac{-18}{-24}=\frac{\left(-18\right):\left(-6\right)}{\left(-24\right):\left(-6\right)}=\frac{3}{4}\)
\(-\frac{35}{70}=-\frac{35:35}{70:35}=\frac{1}{2}\)
\(-\frac{9}{27}=-\frac{9:9}{27:9}=-\frac{1}{3}\)
\(b,\frac{1313}{4242}=\frac{1313:101}{4242:101}=\frac{13}{42}\)
\(\frac{-353535}{-424242}=\frac{\left(-353535\right):\left(-70707\right)}{\left(-424242\right):\left(-70707\right)}=\frac{5}{6}\)
\(c,\frac{2^3\times4^3\times5^4}{8^2\times25^3\times7}=\frac{2^3\times4^3\times25^2}{8\times8^2\times25^2\times25\times7}\) ( 4^3 = 8^2 ; 5^4 = 25^2 )
\(=\frac{1}{25\times7}=\frac{1}{175}\)
\(a.\frac{-9}{-12}=\frac{-9:3}{-12:3}=\frac{-3}{-4}.\)
\(\frac{-18}{-24}=\frac{-18:6}{-24:6}=\frac{-3}{-4}\)
\(\frac{-35}{-70}=\frac{-35:35}{-70:35}=\frac{-1}{-2}\)
\(\frac{-9}{-27}=\frac{-9:9}{-27:9}=\frac{-1}{-3}\)
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xét tổng quát (n-1)(n+1)=n(n+1)-(n+1)=n2+n-n-1=n2-1<n2=n.n
từ đó suy ra 2009.2011=(2010-1).(2010+1)=20102-1<20102=2010.2010
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TL
a) 5x + 20 = 110
<=> x = 90 : 5 = 18
b) x + 18 = - 13
<=> x = - 31
c) 120 - x = 50
<=> x = 70
d) 10 - x = -29
<=> x = 39
e) - x + 31 = 61
<=> x = -30
f) -85 - x = --70
<=> x = 15
Khi nào rảnh vào kênh H-EDITOR xem vid nha!!! Thanks!
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a) 48 x 9 + 24 x 18 + 18 x 52
= 24 x 2 x 9 + 24 x 18 + 18 x 52
= 24 x 18 + 24 x 18 + 18 x 52
= 18 x (24+24+52)
=18 x 100
=1800
a﴿ 48 x 9 + 24 x 18 + 18 x 52
= 24 x 2 x 9 + 24 x 18 + 18 x 52
= 24 x 18 + 24 x 18 + 18 x 52
= 18 x ﴾24+24+52﴿
=18 x 100
=1800
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a) mik hok bít , thông cảm....
b) |x-1|=2
=> x-1=2 và x-1=-2
Nếu x-1=2
x=2+1
x=3.
Nếu x-1=-2
x=-2+1
x=-1
Vậy x=1 hoặc x=-1.
c) (35-x)-70=-45
35-x =-45+70
35-x =25
x =35-25
x =10.
d) 27-3(x-1)=18
3(x-1)=27-18
3(x-1)=9
x-1 =9:3
x-1 =3
x =3+1
x =4.
e) |x|=7
Do x\(\in\)Z nên x=7 hoặc x=-7
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a,\(\frac{37.13-13}{24+37.12}=\frac{36.13}{39.12}=1\)
b,125.7.16.25.4=(125.16).(25.4).7=2000.100.7=1400000
c,8.9.14+6.17.12+19.4.18=2^3.3^2.2.7+2.3.17.2^2.3+19.2^2.3^2.2=2^3.3^2.(2.7+17+19)=72.50=3600
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