Tính
(125 - 1^3 ) . (125 - 2^3 ). (125 - 3^3)......(125 - 15^3)
Tính gấp dùm mình nhé
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a) ( 1000-13) . ( 1000-23) . ( 1000-33) ...( 1000 -503)
\(=\left(1000-1^3\right)\cdot\left(1000-2^3\right)\cdot...\cdot\left(1000-10^3\right)\cdot.....\cdot\left(1000-50^3\right)\)
\(=\left(1000-1^3\right)\cdot\left(100-2^3\right)\cdot...\cdot\left(1000-1000\right)\cdot...\cdot\left(1000-50^3\right)\)
\(=\left(1000-1^3\right)\cdot\left(1000-2^3\right)\cdot......\cdot0\cdot......\left(1000-50^3\right)\)
\(=0\)
b) (1/125-1/13) . (1/125-1/23).( 1/125-1/33)...( 1/125-1/253)
\(\left(\frac{1}{125}-\frac{1}{1^3}\right)\cdot\left(\frac{1}{125}-\frac{1}{2^3}\right)\cdot...\cdot\left(\frac{1}{125}-\frac{1}{5^3}\right)\cdot...\cdot\left(\frac{1}{125}-\frac{1}{25^3}\right)\)
\(=\left(\frac{1}{125}-\frac{1}{1^3}\right)\cdot\left(\frac{1}{125}-\frac{1}{2^3}\right)\cdot...\cdot\left(\frac{1}{125}-\frac{1}{125}\right)\cdot...\cdot\left(\frac{1}{125}-\frac{1}{25^3}\right)\)
\(=\left(\frac{1}{125}-\frac{1}{1^3}\right)\cdot\left(\frac{1}{125}-\frac{1}{2^3}\right)\cdot....\cdot0\cdot...\cdot\left(\frac{1}{125}-\frac{1}{25^3}\right)\)
\(=0\)
a) 125.3 + 125. 64 - 125
= 125 . ( 3 + 64 - 1 )
= 125 .66
= 8250
b) 125.3 + 125.64 + 125
= 125.( 3 + 64 + 1 )
= 125.68
= 8500
C =[125.(73-75)]:(-25)2
=125.(-2):(-25).2
=-250:(-50)
=5
E=125.9.(-4).(-8).25.7
=125.(-8).25.(-4).7.9
=-1000.(-100).63
=6300000
C = ( 125 . 73 - 125 . 75 ) : ( -50)
C = 125 .( -2 ) : (-50)
C = -250 : -50
C = 50
G = ( -3 )2+( -5)3: l -5 l
G = 9 + ( -125) : 5
G = 9 + ( -25 )
G= ( -16 )
E = 125 .9.*( -4 ) . ( -8) .25.7
E = 25.5 .( -4 ) .9 .2. ( -4 ) .25 .7
E =( -100 ).10.( -100).63
E = 10000.630
E = 630000
**** mha
a)-125.24+24.225
=24.(-125+225)
=24.100
=2400
b)-26.125-125.(-36)
=125.(-26+36)
=125.10
=1250
(125 - 1^3 ) . (125 - 2^3 ). (125 - 3^3)......(125 - 15^3)