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( 3092 x 0,75 - 408 x 3/4 ) : 6/4
= ( 3092 x 0,75 - 408 x 0.75 ) x 4/6
= 0,75 x (3092- 408) x 4/6
= 3/4 x 2684 x 4/6
= 12/24 x 2684
= 0,5 x 2684
= 1342
(3092 x 0,75 - 408 x 3 phần 4) : 6 phần 4
=(2319 - 306 ) : 6 phần 4
= 2013 : 6 phần 4
= 1342
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,6\cdot\frac{1}{3}+0,75+\frac{3}{4}:0,25\)
\(< =>6\cdot\frac{1}{3}+\frac{3}{4}+\frac{3}{4}:\frac{1}{4}\)
\(< =>2+\frac{3}{4}:\frac{1}{4}\)
\(< =>2+3\)
\(< =>5\)
\(b,19,5\cdot2,2+8,8\cdot19,5-19,5\)
\(< =>42,9+171,6-19,5\)
\(< =>214,5-19,5\)
\(< =>195\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1) 2,75 - 5/6 × 2/5 = 2,75 - (5/6) × (2/5) = 2,75 - 1/3 = 2,75 - 0,33 = 2,42
2) 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 3/4) - 3/5 = 1,25 - (5/6 - 9/12) - 3/5 = 1,25 - (10/12 - 9/12) - 3/5 = 1,25 - 1/12 - 3/5 = 1,25 - 0,08 - 0,6 = 1,25 - 0,68 = 0,57
3) 4/9 × 0,75 + 8/5 + 3,125 = (4/9) × 0,75 + 8/5 + 3,125 = 0,44 + 8/5 + 3,125 = 0,44 + 1,6 + 3,125 = 0,44 + 4,725 = 5,165
4) 1,125 - 4/7 - 0,12 = 1,125 - (4/7) - 0,12 = 1,125 - 0,57 - 0,12 = 0,435 - 0,12 = 0,315
5) (1/3 + 0,4) × 3,5 + (1/6 + 0,75) × 6/5
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
x - 7,84 = 4,16
x = 4,16 + 7,84
x = 12
b)
(x + 1/4) : 0,01 - (0,75 x 4) = 60
(x + 1/4) : 0,01 - 3 = 60
(x + 1/4) : 0,01 = 63
(x+ 1/4) = 0,63
x = 19/50
![](https://rs.olm.vn/images/avt/0.png?1311)
86 x 0,75 + 14 x \(\frac{3}{4}\)
= 86 x 0,75 + 14 x 0,75
= (86 + 14) x 0,75
= 100 x 0,75
= 75
k mk nha !
![](https://rs.olm.vn/images/avt/0.png?1311)
x - 7.84 = 64% x (2,8 + 3,7)
<=> x - 7.84 = 0,64 x 6.5
<=> x - 7,84 = 4,16
<=> x = 4,16 + 7,84 = 12
(x + \(\frac{1}{4}\) ) : 0,01 - (0,75x4) = 60
<=> (x + \(\frac{1}{4}\) ) x 100 - 3 =60
<=> 100x + 25 - 3 =60
<=> 100x = 38
<=> x = \(\frac{19}{50}\)
a, x - 7,84 = 64% x ( 2,8 + 3,7 )
x - 7,84 = 64% x 6,5
x - 7,84 = 41,6
x = 41,6 + 7,84
x = 49,44
b, ( x + 1/4 ) : 0,01 - ( 0,75 x 4 ) = 60
( x + 0,25 ) : 0,01 - 3 = 60
( x + 0,25 ) : 0,01 = 60 + 3
( x + 0,25 ) : 0,01 = 63
x + 0,25 = 63 x 0,01
x + 0,25 = 0,63
x = 0,63 - 0,25
x = 0,38
\(\frac{3}{4}:\frac{x}{6}=0.75\)
\(\frac{3}{4}\cdot\frac{6}{x}=\frac{3}{4}\)
\(\frac{6}{x}=\frac{3}{4}:\frac{3}{4}\)
\(\frac{6}{x}=1\)
\(x=6\)
3/4 : x/6 = 0,75
x/6 = 0,75 : 0,75
x/6 = 1
x = 6
Hok tốt !!!
~~~ Mon ~~~