Tính giá trị của biểu thức sau:(75*5^4+175*5^4):(20*25*125-625*75)
( 75 . 54 + 175 ) . (75 . 54 + 175 . 54 ) : ( 20 . 25 . 125 - 625 . 75 )
Nguyễn thị kim oanh nè,bài của cậu đây.
Tính nhanh:
(75 x 625+175 x 625) : (20 x 25 x 125 - 625 x 75)
Cách làm:
(75 x 625+175 x 625) : (20 x 25 x 125 - 625 x 75)
=625 x (175+75) : (20 x 5 x 125 x 5 - 625 x 75)
=(625 x 250) : (20 x 5 x 625 - 625 x 75)
=(625 x 250 : (100 x 625 - 625 x 75)
=(625 x 250) : (625 x (100-75))
=(625 x 250) : (625 x 25)
=10
( 75 . 54 + 175 . 54 ) : ( 20 . 25 . 125 - 625 . 75)
( 75 .54 + 175 . 54 ): ( 20 . 25 . 125 - 625 . 75 )
A = (75.54 + 175.54 ) : ( 20 . 25 . 125 - 625 . 75 )
= [(75 + 175).54 ] : (20.25.25.5 - 625.75)
= (250.54 ) : [ 625.(100 - 75)]
= (250.54 ) : (54 . 25)
= 250 : 25
= 10
Thực hiện phép tính
(75 . 54 + 175 . 54) :(20 . 25 . 125)=625
A) ( 20 . 24 + 12 . 24 - 48 . 22) : 82
B) ( 75 . 54 + 175 . 54 ) : ( 20 . 25 . 125 - 625 .75 )
a) \(\left(20.2^4+12.2^4-48.2^2\right):8^2\)
\(=\left(20.2^4+12.2^4-12.2^4\right):8^2\)
\(=2^4.\left(20+12-12\right):8^2\)
\(=16.20:64\)
\(=5\)
=54 . (75+175) ÷ 15625
=54 . .250 ÷ 56
=(54 ÷56) . 250
=0,04 . 250
=10
\(a.\)\(\left(20.2^4+12.2^4-48.2^2\right):8^2\)
\(=\left(20.2^4+12.2^4-12.2^4\right):8^2\)
\(=2^4.\left(20+12-12\right):64\)
\(=2^4.20:64\)
\(=5\)
\(b.\)\(\left(75.5^4+175.5^4\right):\left(20.25.125-625.75\right)\)
\(=5^4.\left(75+175\right):\left(5.4.5^2.5^3-5^4.3.5^2\right)\)
\(=5^4.\left(75+175\right):\left(4.5^2.5^4-5^4.5^2.3\right)\)
\(=5^4.250:5^2.5^4.\left(4-3\right)\)
\(=5^4.2.5^3:5^2.5^4.1\)
\(=\frac{5^4.2.5^3}{5^2.5^4}=\frac{2.5}{1}=10\)
~ Rất vui vì giúp đc bn ~
\(\)
Thực hiện phép tính:
a) ( 23 . 94 + 93 . 45 ) : ( 92 . 10 - 92 )
b) ( 75. 54 + 175 . 54 ) : ( 20 . 25. 125 - 625 . 75 )
a) \(\left(2^3.9^4+9^3.45\right):\left(9^2.10-9^2\right)\)
=\(\left(2^3.9^4+9^3.9.5\right):9^2\left(10-1\right)\)
= \(\left(8-9^4+9^4.5\right):9^2.9\)
=\(9^4\left(8-5\right):9^3\)
=\(9^4.3:9^3\)
=\(9^4:9^3.3\)
=\(9.3\)
=\(27\)
Thực hiện phép tính :
a) 46 - { [ ( 16 + 71 : 4 ) : 15 ] } - 2
b) 120 - { 300 : [ 150 - ( 2 . 53 - 23 . 25 ) ] }
c) ( 20 . 24 + 12 . 24 - 48 . 22 ) : 82
d) ( 75 . 54 + 175 . 54 ) : ( 20 . 25 . 125 - 625 . 75 )
đề ko yêu cầu tính nhanh mà ta,
Thực hiện phép tính :
a) 46 - { [ ( 16 + 71 : 4 ) : 15 ] } - 2
= 46 - { [ ( 16 + 17,75 ) : 15 ] }
= 46 - { 33,75 : 15 }
= 46 - 2,25
= 43,75
b) 120 - { 300 : [ 150 - ( 2 . 53 - 23 . 25 ) ] }
= 120 - { 300 : [ 150 - ( 2 . 53 - 23 . 52 ) ] }
= 120 - { 300 : [ 150 - ( 2 . 52 ( 5 . 22 ) ] }
= 120 - { 300 : [ 150 - ( 50 . 20 ) ] }
= 120 - { 300 : [ 150 - 1000 ] }
= 120 - 300 : ( -850 )
= 120 + \(\frac{300}{850}\)
= \(\frac{10200}{850}\)+ \(\frac{300}{850}\)
= \(\frac{10500}{850}\)
= \(\frac{210}{17}\)
c) ( 20 . 24 + 12 . 24 - 48 . 22 ) : 82
= [ 24 . ( 20 + 12 ) - 48 . 4 ] : 64
= ( 32 . 24 - 49 ) : 64
= ( 768 - 49 ) : 64
= 768 : 64 + 49 : 64
= 12 + 49 : 43
= 12 + 46
= 12 + 4096
= 4108
d) ( 75 . 54 + 175 . 54 ) : ( 20 . 25 . 125 - 625 . 75 )
= [ 54 . ( 75 + 175 ) ] : ( 62500 - 625 . 75 )
= 54 . 250 : 625 . ( 100 - 75 )
= 52 . ( 52 . 10 ) : 625 . 25
= 25 . 250 : 625 . 25
= 250