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\(\frac{64X50+44X100}{27X38+146X19}=\frac{64X50+44X2X50}{27X2X38+146X19}=\frac{64X50+88X100}{54X38+146X19}=\frac{50X\left(64+88\right)}{19X\left(54+146\right)}=\frac{50X152}{19X200}\)\(=\frac{̸5̸̸0X152}{19X4X̸5̸0}=\frac{152}{76}=2\) Đáp số :2
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15/19.38/35=6/7=90/105
67/15=469/105
Mà 90/105<105x/105<469/105
Vậy 90<105x<469
6/7<x<469/105
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a) 9/22 và 33/18 = 1/2 x 3/2 = 3/4
b) 12/35 : 36/25 = 12/35 X 25/36 = 1/7 x 5/3 = 5/21
c) 19/17 : 76/51 = 19/17 x 51/76 = 1/1 x 3/4 = 3/4
k mk nha
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(18+38+16*76-1)=(36*19+64*20-65)-x
=>(18+38+1216-1)=(684+1280-65)-x
=>1271=1899-x
=>1899-x=1271
x = 1899-1271
x=628
vậy x= 628
( 18 + 38 + 1216 - 1) = ( 684 +1280 - 65) - x
( 56 + 1216 - 1) = ( 1964 - 65) - x
1271 = 1899 - x
x = 1899 - 1271
x = 628
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1,25 x 17 + 1,25 x 43 +1,25 x 40
= 1,25 x ( 17 + 43 + 40 )
= 1,25 x 100
= 125
38,67 x 50 - 38,67 x 27 - 38,67 x 13
= 38,67 x ( 50 - 27 - 13 )
= 38,67 x 10
= 386,7
125 x 0,4 x 25 x 0,8
= ( 125 x 0,8 ) x ( 25 x 0,4 )
= 100 x 10
= 1000
a, Ta có: 1,25 * 17 + 1,25*43 + 1,25*40
= 1,25 * ( 17 + 43 + 40 )
= 1,25 * 100
= 125
b, Ta có: 38,67 * 50 - 38,67 * 27 - 38,67 * 13
= 38,67 * ( 50 - 27 - 13 )
= 38,67 * 10
= 386,7
c, Ta có: 125 * 0,4 * 25 * 0,8
= 125 * \(\frac{2}{5}\)* 25 * \(\frac{4}{5}\)
= 125 * 25 * \(\frac{8}{25}\)
= 125 * 8
= 1000
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\(\frac{12}{19}\times\frac{38}{5}=\frac{24}{5};\frac{67}{15}+\frac{56}{15}=\frac{41}{5}\)
\(\Rightarrow\frac{24}{5}< x< \frac{41}{5}\)
\(\Rightarrow x\in\left\{5;6;7;8\right\}\)
Vậy x thuộc {5;6;7;8} ...
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