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1) Tính nhanh
a) Ta có: \(5\cdot79\cdot4\cdot2\cdot25\)
\(=\left(5\cdot2\right)\cdot\left(4\cdot25\right)\cdot79\)
\(=79\cdot10\cdot100\)
\(=79000\)
b) Ta có: \(27\cdot121-87\cdot27+73\cdot34\)
\(=27\cdot\left(121-87\right)+73\cdot34\)
\(=27\cdot34+73\cdot34\)
\(=34\cdot\left(27+73\right)\)
\(=34\cdot100=3400\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Trả lời
a)5.25.8.125.4
=(25.4).(125.8).5
=100.1000.5
=500000
b)39.101
=3939
c)27.121-87.27+73.34
=27.(121-87)+73.34
=27.34+73.34
=34.(27+73)
=34.100
=3400
#học tốt nha !
a) 5 . 25 . 8 . 125 . 4
=( 25 . 4 ) . ( 125 . 8 ) . 5
= 100 . 1 000 . 5
= 100 000 . 5
= 500 000
b) 39 . 101
= 39 . ( 100 +1 )
= ( 39 .100 ) + ( 39 . 1 )
= 3 900 + 39
= 3 939
c) 27. 121 - 87 . 27 + 73 .34
= 27 . ( 121 - 87 ) + 73 . 34
= 27 . 34 + 73 . 34
= ( 27 + 73 ) . 34
= 100 . 34
= 3 400
Chúc bạn học tốt nhé !
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a, 48.19 + 48.115 + 134.52
= 48 . ( 19 + 115 ) + 134.52
= 48 . 134 + 134 . 52
= 134 . ( 48 + 52 )
= 134 . 100
= 13400
b, 27 . 121 - 87 . 27 + 73 . 34
= 27 . ( 121 - 87 ) + 73 . 34
= 27 . 34 + 73 . 34
= 34 . ( 27 + 73 )
= 34 . 100
= 3400
a, 48 . 19 + 48 . 115 + 134 . 52
= 48 . ( 19 + 115 ) + 134 . 52
= 48 . 134 + 134 . 52
= ( 48 + 52 ) . 134
= 100 . 134
= 13400
b, 27 . 121 - 87 . 27 + 73 . 34
= 27 . ( 121 - 87 ) + 73 . 34
= 27 . 34 + 73 . 34
= ( 27 + 73 ) . 34
= 100 . 34
= 3400
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 48 . 19 + 48 . 115 + 134 . 52 b) 27 . 121 - 87 . 27 + 73 . 34 c) 29 . 38 - 29 . 23 + 64 . 71
= 48 . ( 19 + 15 ) + 134 . 52 = 27 . ( 121 - 87 ) + 73 . 34 = 29 . ( 38 - 23 ) + 64 . 71
= 48 . 134 + 134 . 52 = 27 . 34 + 73 . 34 = 29 . 15 + 64 . 71
= 134 . ( 48 +52 ) = 34 . ( 27 + 73 ) = 4979
= 134 . 100 = 34 . 100
= 13400 = 3400
Phần c) mình thấy hơi sai sai đề , bạn xem lại đề nhé
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a 58 x 75 + 58 x50 - 58 x25
= 58 x { 75 + 50 -25}
=58 x 100
=5800
27 x 121 - 87 x27 +73x34
=27 x { 121 - 87 } + 73 x 34
=27 x 34 + 73 x34
= 34x { 27 + 37}
=27 x100
=2700
![](https://rs.olm.vn/images/avt/0.png?1311)
a,48.(19+115)+134.52=48.134+134.52=134.(48+52)=134.100=13400
b,27.(121-87)+73.364=27.34+73.34=34.(73+27)=34.100=3400
c,125.(98-46)-52.25=125.52-52.25=25.(125-25)=25.100=2500
tick nha
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25. 71 .50 . 4 .2
e) 48.19 + 48.115 + 134.52
f) 136.23 + 136.17
–
40.36;
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Bài 1
a) (3x - 2⁴).7³ = 2.7⁴
3x - 16 = 2.7⁴ : 7³
3x - 16 = 2.7
3x - 16 = 14
3x = 14 + 16
3x =30
x = 30 : 3
x = 10
b) x - [42 + (-28)] = -8
x - 14 = -8
x = -8 + 14
x = 6
c) 4 - 7.x = x - (13 - 4)
x + 7x = 4 + 9
8x = 13
x = 13/8
Bài 1: a, (3\(x\) - 24 ).73 = 2.74
3\(x\) - 24 = 2.74 : 73
3\(x\) - 16 = 14
3\(x\) = 30
\(x\) = 10
b, \(x\) - (42 + (-28) ] = -8
\(x\) - 14 = -8
\(x\) = 14 - 8
\(x\) = 6
c, 4 - (7\(x\)) = \(x\) - (13 - 4)
4 - 7\(x\) = \(x\) - 9
\(x\) + 7\(x\) = 4 + 9
8\(x\) = 13
\(x\) = \(\dfrac{13}{8}\)
27 . 121 - 87 . 27 + 73 .54
= 27 . 121 - 87 . 27 + 73 . 2 . 27
= 27 . (121 - 87 + 73 . 2)
= 27 . 180
= 4860
\(27\cdot121-87\cdot27+73\cdot54\)
\(=27\cdot121-87\cdot27+146\cdot27\)
\(=27\left(121-87+146\right)\)
\(=27\cdot180\)
\(=4860\)