- | 4,63 - 5/3/5 | + | 3,37 - 2/2/5 |
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](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 ) 5,432 × 5,39 - 4,63 : 2,25 + 11,6
= 29,27848 - 4,63 : 2,25 + 11,6
= 29,27848 - 2,05 ( 7 ) + 11,6
= 27,22070222 + 11,6
= 38,82070222
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 4,63 x ( 3,4 : 0,2 ) - 24 + 3,25 = 57,96
b) 3 - 1/4 - 2/1/5 = 11/20
c) 42 : 6 + 2 x 14 - 4 = 31
d) 5 - 1/1/2 x 1/5 = 47/10
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{15}{16}:\frac{3}{8}\)
=\(\frac{15}{16}\times\frac{8}{3}\)
=\(\frac{5}{2}\)
\(\frac{12}{13}:6\)
=\(\frac{12}{13}\times\frac{6}{1}\)
=\(\frac{12}{13}\times\frac{1}{6}\)
=\(\frac{2}{13}\)
12:\(\frac{3}{5}\)
=12\(\times\frac{5}{3}\)
=20
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(=\left(\frac{-337}{100}:\frac{40}{100}\right).\frac{250}{100}=\frac{-337}{40}.\frac{40}{16}=-\frac{337}{16}\)
b) \(=\frac{-1}{8}.\left(-5,3\right).8=\frac{-1}{8}.8.\left(-5,3\right)=-1.\left(-5,3\right)=5,3\)
c) \(=10.\left(-7,9\right)=-79\)
d) \(=-\frac{3}{8}.\frac{13}{3}.\left(-8\right)=\left[-\frac{3}{8}.\left(-8\right)\right].\frac{13}{3}=3.\frac{13}{3}=13\)
a)(-3,37:0,4).2,5
=(-8,425).2,5
=-21,0625
b) (-0,125) . (-5,3) . 8
=(-0,125).8.(-5,3)
=(-1).(-5,3)
=5,3
c)(-2,5).(-4).(-7,9)
=10.(-7,9)
=-79
d)(-0,375).\(4\frac{1}{3}\).(-2)3
=(-0,375).(-2)3.\(4\frac{1}{3}\)
=3.\(\frac{13}{3}\)
=13
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 42,31 = 29,1 x 2
x + 42,31 = 58,2
x = 15,89
4,63 x x + x x 5,37 = 38
x x (4,63 + 5,37) = 38
x x 10 = 38
x = 3,8
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1 :
a, 5/7 - 3/6 + 2/7 + 9/6 - 4/3 - 1/3
= (5/7 + 2/7) + (9/6 - 3/6) - (4/3 + 1/3)
= 1 + 1 - 5/3
= 2- 5/3
= 1/3
b. 0,75 + 5,64 + ( 7,25 - 3,14 )
= (0,75 + 7,25) + (5,64 - 3,14)
= 8 + 2,5
= 10,5
c, 15/26 x 39/25 x 54/18 x 36/27 ( Làm = cách triệt tiêu )
\(=\frac{15\cdot39\cdot54\cdot36}{26\cdot25\cdot18\cdot27}\)
\(=\frac{3\cdot5\cdot3\cdot13\cdot27\cdot2\cdot2\cdot18}{2\cdot13\cdot5\cdot5\cdot18\cdot27}\)
\(=\frac{3\cdot3\cdot2}{5}\)
\(=\frac{18}{5}\)
Bài 2 : Tìm x
a, ( 6,73 + 5,26 - 3,5 ) - x = 4,32 - 2,56
8,49 - x = 1,76
x= 8,49 - 1,76
x= 6,73
b, x : ( 7,25 - 5,42 ) = 4,63 +1,37
x : 1,83 = 6
x= 6 * 1,83
x= 10,98
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
a) \(6,125\approx6,13\)
b) \(21,333\approx21,33\)
c) \(5,666\approx5,67\)
d) \(5,346\approx5,35\)
e) \(2,\left(321\right)=2,321321...\approx2,32\)
f) \(-4,63\left(3\right)=-4.6333...\approx-4,63\)
g) \(\dfrac{3}{7}=0,\left(428571\right)\approx0,43\)
Bài 2:
a) \(\sqrt{2}\approx1,414\)
b) \(\sqrt{2}\approx1,41\)
c) \(\sqrt{2}\approx1,4\)
Bài 1 :
a) \(6,125\sim6,1\)
b) \(21,333\sim21,3\)
c) \(5,666\sim5,7\)
d) \(5,346\sim5,3\)
e) \(2,\left(312\right)\sim2,3\)
f) \(-4,63\left(3\right)=-4,6\)
g) \(\dfrac{3}{7}\sim0,429\sim0,4\)