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5/4-yx5/6=-1/12
5/4-y = -1/12:5/6
5/4-y = -1/10
y = 5/4-(-1/10)
y = 27/20
\(\frac{5}{4}-y.\frac{5}{6}=\frac{1}{4}-\frac{1}{3}\)
\(\Rightarrow\frac{5}{4}-y.\frac{5}{6}=-\frac{1}{12}\)
\(\Rightarrow y.\frac{5}{6}=\frac{5}{4}-\left(-\frac{1}{12}\right)\)
\(\Rightarrow y.\frac{5}{6}=\frac{5}{4}+\frac{1}{12}\)
\(\Rightarrow y.\frac{5}{6}=\frac{4}{3}\)
\(\Rightarrow y=\frac{4}{3}:\frac{5}{6}\)
\(\Rightarrow y=\frac{8}{5}\)
Vậy \(y=\frac{8}{5}.\)
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12 x 194+6x+3x369x4=
12x194+6x2x437+3x4x369=
12x194+12x437+12x369=
12x{194+437+369}=
12x1000=
12000
1+5+9+13+.....+57+61+65x2-6
={65+1}x4:2x2-6
=66x2x2-6
=132x2-6
=264-6
=258
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0,24 x 450 + 0,8 x 15 x 3 + 3 x 3 x 8
= 0,24 x 450 + 0,24 x 150 + 0,24 x 300
= 0,24 x ( 450 + 150 + 300 )
= 0,24 x 900
= 216
Toán lớp 5 dễ mà ! Thui ! ~ nyan ! Bây giờ T-I-C-H cho mik nhá !!!!
(2,5 x 11,25 + 11,25 x 7,5) x( 75 x 11 - 75 : 0,1 - 75)
ai nhanh tớ sẽ tick ạ, ghi đầy đủ lời giải ạ![](https://rs.olm.vn/images/avt/0.png?1311)
= ( 11,25 x (2,5 + 7,5) ) x ( 75 x 11 - 75 : 0,1 -75 x1)
=( 11,25 x 10) x (75 x ( 11 -1 :0,1 ) )
= 112,5 x ( 75 x 100 )
= 112,5 x 7500
= 1125000
( 2,5 \(\times\) 11,25 \(\) + 11,25 \(\times\)7,5) \(\times\)( 75 \(\times\) 11 - 75: 0,1 - 75)
= (2,5 \(\times\) 11,25 + 11,25 \(\times\) 7,5) \(\times\)( 75 \(\times\) 11 - 75 \(\times\) 10 - 75 \(\times\) 1)
=( 2,5 \(\times\) 11,25 + 11,25 \(\times\) 7,5) \(\times\) 75 \(\times\)( 11 - 10 - 1)
= ( 2,5 \(\times\) 11,25 + 11,25 \(\times\)7,5 ) \(\times\) 75 \(\times\) 0
= 0
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![](https://rs.olm.vn/images/avt/0.png?1311)
399 + 254 x 399 - 399 x 255 : 399 x 254 + 399 x 255
1 x 399 + 254 x 399 - 399 x 255 : 399 x 254 + 399 x 255
( 1 + 254 - 255 ) x 399 : 399 x ( 254 + 255 )
0 x 399 x A
0
\(\frac{254\times399-145}{254+399\times253}=\frac{'253+1'\times399-145}{254+399\times253}\)
\(=\frac{235\times399-145}{254+399\times253}\)
\(=\frac{253\times399+254}{254+399\times253}\)
\(=1\)
Vậy: Số cần tìm là :1
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(min\left\{\left(2007+2005\right):\left(x-4\right)\right\}\)
\(=min\left\{4012:\left(x-4\right)\right\}\)
\(\Rightarrow min\left\{x-4\left(\ne0\right)\right\}\)
\(\Rightarrow x=3\)
tick lại tớ nha tớ tick rùi
tick tớ nhé .