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sakura
Tính nhanh:
a) 56 x 44 + 56 x 11 + 56 x 45
= 56 x ( 44 + 11 + 45 )
= 56 x 100
= 5600
b) 8 x 3 + 8 x 6 + 8
= 8 x ( 3 + 6 + 1 )
= 8 x 10
= 80
^^ Học tốt!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\dfrac{2}{5}\cdot\dfrac{5}{8}\cdot...\cdot\dfrac{53}{56}=\dfrac{2}{56}=\dfrac{1}{28}\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
1. A) 225886 + 779 × 8
= 225886 + 6232
= 232118
B) 125 × 5 × 20 × 8
= (125 × 8) × (5 × 20)
= 1000 × 100
= 100000
C) 47286 : 2 + 14765
= 23643 + 14765
= 38408
D) 91428 - 23560 : 5
= 91428 - 4712
= 86716
3. A) 36 × 532 + 63 × 532 + 532
= 532 × (36 + 63 + 1)
= 532 × 100
= 53200
B) 679 × 123 + 679 - 679 × 24
= 679 × (123 + 1 - 24)
= 679 × 100
= 67900
C) 245 × 327 - 245 × 18 - 9 × 245
= 246 × (327 - 18 - 9)
= 245 × 300
= 73500
![](https://rs.olm.vn/images/avt/0.png?1311)
3. Tính bằng cách thuận tiện nhất
A, 36 x 532 + 63 x 532 + 532
= (36 + 63 + 1) x 532 = 100 x 532 = 53 200
B, 679 x 123 + 679 - 679 x 24
= 679 x (123 + 1 - 24)
= 679 x 100 = 67 900
C, 245 x 327 - 245 x 18 - 9 x 245
= 245 x (327 - 18 - 9)
= 245 x 300
= 73 500
Bài 2:
a: \(6\cdot\left(x+9845\right)=29042\)
=>\(x+9845=\dfrac{29042}{6}=\dfrac{14521}{3}\)
=>\(x=\dfrac{14521}{3}-9845=-\dfrac{15014}{3}\)
b: \(\left(x:3\right)\cdot8=8\cdot3198\)
=>\(x:3=3198\)
=>\(x=3198\cdot3=9594\)
Bài 1:
a: \(225886+779\cdot8\)
\(=225886+6232\)
\(=232118\)
b: \(125\cdot5\cdot20\cdot8\)
\(=\left(125\cdot8\right)\cdot\left(5\cdot20\right)\)
\(=1000\cdot100=100000\)
c: \(47286:2+14765\)
\(=23643+14765\)
=38408
d: \(91428-23560:5\)
\(=91428-4712\)
=86716
![](https://rs.olm.vn/images/avt/0.png?1311)
` 1/2 + 3/4 - 5/6 = 6/12 + 9/12 - 10/12 = 5/12`
` ( 5/6 + 3/8) xx 2/7 = ( 15/24 + 9/24) xx 2/7 = 29/24 xx 2/7 = 29/84`
` ( 7/6 - 3/4) : 3/5 = ( 14/12 - 9/12) : 3/5 = 5/12 : 3/5 = 5/12 xx 5/3 = 25/36`
` 6/7 xx 2/3 : 5/7 = 6/7 xx 2/3 xx 7/5 = 4/5`
![](https://rs.olm.vn/images/avt/0.png?1311)
Tham khảo
a, 5<6 => 5/7 < 6/7
b, 17/13 > 1 45/52< 1 => 45/52 < 17/13
c, 8/7 > 1 7/8< 1 => 7/8 >< 8/7
d, 9/5 > 1 5/8 < 1 => 9/5 > 5/8
![](https://rs.olm.vn/images/avt/0.png?1311)
5/7<7/6
17/13>45/52
4/3>99/100
34/56<42/53
97/252>85/163
73/97<91/95
5/7<7/6
17/13>45/52
4/3>99/100
34/56<42/53
97/252>85/163
73/97<91/95
ko có rảnh đâu nha con
\(\dfrac{8}{x}+3=\dfrac{56}{91}\)
\(\dfrac{8}{x}=\dfrac{56}{91}-3\)
\(\dfrac{8}{x}=-\dfrac{31}{13}\)
\(x=-\dfrac{8\times13}{31}=-\dfrac{104}{31}\)
`8/x + 3 = 56/91`
`=> 8/x= 56/91-3`
`=>8/x=-31/13`
`=> 8 xx 13 =-31x`
`=> -31x=104`
`=>x=104:(-31)`
`=>x=-104/31`