125/175=5/?=?/317=75/?
6/5=18/?=?/80=90/?
( 75 . 54 + 175 ) . (75 . 54 + 175 . 54 ) : ( 20 . 25 . 125 - 625 . 75 )
tính (125^3*75 -175^5:5):2001^2002
( 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
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
Tính giá trị của biểu thức sau:(75*5^4+175*5^4):(20*25*125-625*75)
\(\dfrac{75.5^4+175.5^4}{20.25.125-625.75}\)
\(=\dfrac{5^4\left(175+75\right)}{4.5.5^2.5^3-5^4.5^2.3}=\dfrac{5^4.225}{4.5^6-3.5^6}\)
\(=\dfrac{5^4.225}{4.5^6-3.5^6}=\dfrac{5^4.15^2}{5^6\left(4-3\right)}=\dfrac{5^4.\left(5.3\right)^2}{5^6}=\dfrac{5^4.5^2.3^2}{5^6}=\dfrac{5^6.3^2}{5^6}=9\)
(1253.75-1755:5):20162017=?
[ ( 125 )3 x 75 - 1755 : 5 ] : 20022020
ban viet mu kieu j day chi mik mik lam giup
= [ 1253 x 75 - 1755 : 5 ] : 20022002
= -32679687500 : 20022002
= 0
tính (1253.75-1755 : 5 ):20012002
Lời giải:
$125^3.75-175^5:5=(5^3)^3.5^2.3-(5^2.7)^5:5$
$=5^9.5^2.3-5^{10}.7^5:5$
$=5^{11}.3-5^9.7^5=5^9(5^2.3-7^5)=5^9(-16732)$
$\Rightarrow (125^3.75-175^5:5):2001^{2002}=\frac{-16732.5^9}{2001^{2002}}$