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a, 98x8+98x13-98
=98x8+98x13-98x1
=98x[8+13-1]
=98x20
=1960
b,125x63x8
=[125x8]x63
=1000x63
=63000
\(a,250:25+1750:25+500:25=\left(250+1750+500\right):25=2500:25=100\\ b,\left(480\times25\right):60=\left(480:60\right)\times25=8\times25=200\)
a) \(250:25+1750:25+500:25\)
\(=\left(250+1750+500\right):25\)
\(=2500:25\)
\(=100\)
\(a.\left(\dfrac{2}{5}.\dfrac{5}{2}\right).\dfrac{10}{21}=1.\dfrac{10}{21}=\dfrac{10}{21}\)
\(\dfrac{1}{2}.4+\dfrac{3}{4}.4=2+3=5\)
a) \(=23.\left(1305-305\right)\)
\(=23.1000\)
\(=23000\)
b) \(=57.\left(84+15+1\right)\)
\(=57.100\)
\(=5700\)
a,1305x23-305x23
=(1305-305)x23
= 1000x23
= 23000
b,84x57+15x57+57
=84x57+15x57+57x1
=(84+15+1)x57
= 100x57
=5700
20x190x50
=(20x50)x190
=100x190
=19000
(900x28):9
=(900:9)x28
=100x28
=2800
20 x 120 x 50
= [ 20 x 50 ] x 120
= 100 x 50
= 19000
[ 900 x 28 ] : 9
= [ 900 : 9 ] : 29
= 100 x 28
= 2800
=
\(=\left(\dfrac{1}{3}:\dfrac{8}{3}\right)\times16=\dfrac{1}{8}\times16=\dfrac{16}{8}=2\)
\(\dfrac{3}{5}\times\dfrac{2}{7}-\dfrac{3}{5}\times\dfrac{4}{7} +\dfrac{3}{5}\)
\(=\dfrac{3}{5}\times\left(1+\dfrac{2}{7}-\dfrac{4}{7}\right)\)
\(=\dfrac{3}{5}\times\left(\dfrac{7}{7}+\dfrac{2}{7}-\dfrac{4}{7}\right)\)
\(=\dfrac{3}{5}\times\left(\dfrac{7+2-4}{7}\right)\)
\(=\dfrac{3}{5}\times\dfrac{5}{7}\)
\(=\dfrac{3}{7}\)
= 3/5 x 2/7 - 3/5 x 4/7 + 3/5 x 1
= 3/5 x ( 2/7 + 4/7 + 1 )
= 3/5 x 1
= 3/5
245x15+245x3-245x8
= 245x(15+3-8)
= 245x10
= 2450
HT và $$$
245x15+245x3-245x8
=245x(15+3-8)
=245x10
=2450
Nhớ k nhe
--HT--
a ) 4567 x 3 + 4 x 4567 + 4567 x 2 + 4567
= 4567 x 3 + 4567 x 4 + 4567 x 2 + 4567 x 1
= ( 3 + 4 + 2 + 1 ) x 4567
= 10 x 4567
= 45670
b ) 3896 x 20 + 40 x 3896 + 3896 x 30 + 3896
= 3896 x 20 + 3896 x 40 + 3896 x 30 + 3896 x 1
= ( 20 + 40 + 30 + 1 ) x 3896
= 91 x 3896
= 354536
Mk trả lời đầu tiên , bạn k mình nhé !
a,4567x3 + 4x4567+4567x2+4567=4567x[3+4+2+1]+4=4567x10+4=45670+4=45674
b,3896x20+40x3896+3896x30+3896=3896x[20+40+30+1]=3896x91=
con lai tu tinh nha dung quan h
a) 125 x (8 x 123)
= (125 x 8) x 123
= 1000 x 123
= 123000
b) 55 x 739 + 55 x 261 - 5000
= 55 x (739 + 261) - 5000
= 55 x 1000 - 5000
= 55000 - 5000
= 50000
a) 125 × (8 × 123)
= (125 × 8) × 123
= 1000 × 123
= 123000
b) 55 × 739 + 55 × 261 - 5000
= 55 × (739 + 261) - 5000
= 55 × 1000 - 5000
= 55000 - 5000
= 50000