tính
31/48x 32/93
77/80 x 48/49
154/125 x 25/44
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\(48\left(x-2\right)=48x+25\)
\(\Rightarrow48x-48.2=48x+25\)
\(\Rightarrow48x-96=48x+25\)
\(\Rightarrow48x-48x=25+96=121\)
\(\Rightarrow0=121\)
=> Vô lí
\(\dfrac{7}{16}+\dfrac{-1}{8}+\dfrac{9}{32}=\dfrac{14}{32}-\dfrac{4}{32}+\dfrac{9}{32}=\dfrac{19}{32}\)
\(\dfrac{5}{4}-\dfrac{25}{30}\times\dfrac{37}{44}+\dfrac{-25}{30}\times\dfrac{13}{44}+\dfrac{-25}{30}\times\dfrac{-6}{44}\)
\(=-\dfrac{25}{30}\times\left(\dfrac{5}{4}+\dfrac{37}{44}+\dfrac{13}{44}-\dfrac{6}{44}\right)\)
\(=-\dfrac{25}{30}\times\left(\dfrac{55}{44}+\dfrac{37}{44}+\dfrac{13}{44}-\dfrac{6}{44}\right)\)
\(=-\dfrac{25}{30}\times\dfrac{99}{44}\)
\(=-\dfrac{5}{6}\times\dfrac{9}{4}\)
\(=-\dfrac{15}{8}\)
\(\left(\dfrac{7}{16}+\dfrac{-1}{8}+\dfrac{9}{32}\right):\dfrac{5}{4}\)
\(=\left(\dfrac{14}{32}+\dfrac{-4}{32}+\dfrac{9}{32}\right):\dfrac{5}{4}\)
\(=\dfrac{19}{32}:\dfrac{5}{4}\)
\(=\dfrac{19}{32}.\dfrac{4}{5}=\dfrac{19.4}{32.5}=\dfrac{19}{40}\)
\(\dfrac{-25}{30}.\dfrac{37}{44}+\dfrac{-25}{30}.\dfrac{13}{44}+\dfrac{-25}{30}.\dfrac{-6}{44}\)
\(=\dfrac{-25}{30}.\left(\dfrac{37}{44}+\dfrac{13}{44}+\dfrac{-6}{44}\right)\)
\(=\dfrac{-25}{30}.\dfrac{44}{44}=\dfrac{-5}{6}.1=-\dfrac{5}{6}\)
a) \(125\times25\times8\times4\)
\(\Rightarrow\left(125\times8\right)\times\left(25\times4\right)\)
\(\Rightarrow1000\times100\)
\(\Rightarrow100000\)
25 x 10 = 250
11 : 0,25 = 44
32 : 0,5 = 64
48 : 0,1 = 480
125 : 0,5 = 250
a) 125-(-75)+32-(48+32) = 125 + 75 + 32 - 48 - 32 = 200 - 48 = 152
b) 47.347+347.(-47) = 347.( 14 - 47 ) = 347 . 0 = 0
c) x-10=-14
x = -14 +10
x = -4
d) 15 + x = 13
x = 13 - 15
x = -2
e) 25 . x = -75
x = -75/25
x = -3
g) 5x - 16 = -46
5x = -46 + 16
5x = - 30
x = -6
i) 3x - (-11) = -4
3x + 11 = -4
3x = -4 - 11
3x = -15
x = -5
hok tốt!!
\(125^{80}=\left(5^3\right)^{80}=5^{240}\)
\(25^{48}=\left(5^2\right)^{48}=5^{96}\)
Vì 240 > 96 mà 5 = 5
=> \(5^{240}>5^{96}\)
=> \(125^{80}>25^{48}\)
12580 và 2548
12580=( 53) 80 =5240
2548 = (52)48 =596
=>5240 >596=>12580 > 2548
Làm theo cách này nhé :
a = 2 / 60 x 63 + 2 / 63 x 66 + 2 / 66x 69 + ...+ 2 / 117 x 120 + 2 / 2011
= 2/3 x ( 3/60 x 63 + 3 / 63 x 66 + 3 / 66 x 69 + ...+ 3/117 x 120 ) + 2/2011
= 2/3 x ( 1/60 - 1/63 + 1/63 - 1/66 + 1/66 - 1/69 + ... + 1/117 - 1/120 ) + 2/2011
= 2/3 x ( 1/60 - 1/120 ) + 2/2011
= 2/3 x 1/120 + 2/2011
= 1/180 + 2/2011
b = 5/ 40 x 44 + 5 / 44 x 48 + ...+ 5/76 x 80 + 5/ 2011
= 5/4 x ( 4/40 x 44 + 4/44 x 48 + ...+ 4/76 x 80 ) + 5/2011
= 5/4 x ( 1/40 - 1/44 + 1/44 - 1/48 + ...+ 1/76 - 1/80 ) + 5/2011
= 5/4 x ( 1/40 - 1/80 ) + 5/2011
= 5/4 x 1/80 + 5/2011
= 1/64 + 5/2011
Do 1/64 > 1/80 ; 5/2011 > 2/2011
=> 1/64 + 5/2011 > 1/80 + 2/2011
=> b > a
K nha
X + 27 = 72
X = 72 − 27
X = 45
X − 38 = 25
X = 25 + 38
X = 63
80 − x = 44
X = 80 − 44
X = 36
\(\dfrac{31}{48}\times\dfrac{32}{93}\)
\(=\dfrac{31\times32}{48\times93}\)
\(=\dfrac{1\times2}{3\times3}\)
\(=\dfrac{2}{9}\)
============
\(\dfrac{77}{80}\times\dfrac{48}{49}\)
\(=\dfrac{77\times48}{80\times49}\)
\(=\dfrac{11\times3}{5\times7}\)
\(=\dfrac{33}{35}\)
=============
\(\dfrac{154}{125}\times\dfrac{25}{44}\)
\(=\dfrac{154}{125}\times\dfrac{25}{44}\)
\(=\dfrac{7\times1}{5\times2}\)
\(=\dfrac{7}{10}\)