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a) \(18,71-9,24+16,29-6,76\)
\(=\left(18,71+16,29\right)-9,24-6,76\)
\(=\left(18,71+16,29\right)-\left(9,24+6,76\right)\)
\(=35-16=19\)
b) \(25,75+24,36-35,75\)
\(=25,75+24,36-\left(25,75+10\right)\)
\(=25,75+24,36-25,75-10\)
\(=\left(25,75-25,75\right)+\left(24,36-10\right)\)
\(=0+14,36=14,36\)
a) 18,71 - 9,24 +16,29 -6,76
= (18,71 + 16,29) - (9,24 +6,76)
= 35 - 16
= 19
b) 25,75 + 24,36 -35,75
= 25,75 + 24,36 - ( 25,75 + 10)
= 25 ,75 + 24,36 - 25,75 - 10
= (25,75 - 25,75 ) + ( 24,36 -10 )
= 0 +14,36
= 14,36
a)
=9,85.(25,82-12,32-3,5)
=9,85.10
=98,5.
b)
=5/4.1/4.4.4/5.1/4.6/5
=3/40.
7/9 + 2/3 + 2/9 + 1
= (7/9 + 2/9) + 1 + 2/3
= 1 + 1 + 2/3
= 2 + 2/3
= 8/3
a. 18,71 + 16,29 - ( 9,24 + 6,76 ) = 18,71 + 16,29 - 16 = 18,71 + 0,29 = 19
a,18,71-9,24+16,29-6,7
=(18,71-9,24)+(16,29-6,7)
=9,47+9,59
=19,06
b,25,75+24,36-35,75
=(35,75+25,75)+24,36
=61,5+24,36
=85,86
c,2,5 x 12,5 x 0,8 x 4
=(2,5 x 4) x (12,5 x 0,8)
=10 x 10
=100
d,0,125x0,6x8
=(0,125x8)x0,6
=1x0,6
=0,6
\(\left(42,8\cdot6,9-154,56\right):34,5\)
\(=\left(295,32-154,56\right):34,5\)
\(=\frac{107}{56}:34,5\)
\(=\frac{107}{1932}=0,05...\)
Hc tốt #
\(\left(42,8\times6,9-154,56\right):34,5\)
\(=\left(295,32-154,56\right):34,5\)
\(=140,76:34,5\)
\(=4,08\)
2007,2007 + 2008,2008 + 2009,2009
= ( 2007,2007 + 1,0001 ) + 2008,2008 + ( 2009,2009 - 1,0001 )
= 2008,2008 + 2008,2008 + 2008,2008
= 2008,2008 x 3
= 6024,6024
14,35 × 63 + 14,35 × 36 + 14,35
= 14,35 x 63 + 14,35 x 36 + 14,35 x 1
= 14,35 x ( 63 + 36 + 1 )
= 14,56 x 100
= 1456
\(14,35\times63+14,35\times36+14,35\)
\(=14,35\times\left(63+36+1\right)\)
\(=14,35\times100\)
\(=1435\)