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a, 2x9x5x7x4x25
=2x5x4x25x9x7
=10x100x63
=63000
b,6x14x5x25x3x4
=6x5x3x4x25x14
=90x100x14
=9000x14
=126000
~HT~
a, 2.9.5.7.4.25=(2.5).(25.4).(7.9)
=10.100.63=63000
câu b làm tương tự tích giúp mình nha
\(a\) \(\dfrac{3}{5}+\dfrac{1}{3}=\dfrac{9}{15}+\dfrac{5}{15}=\dfrac{14}{15}\)
\(b\) \(\dfrac{17}{20}-\dfrac{4}{5}=\dfrac{17}{20}-\dfrac{16}{20}-\dfrac{1}{20}\)
\(c\) \(\dfrac{25}{35}\times\dfrac{4}{5}=\dfrac{5}{7}\times\dfrac{4}{5}=\dfrac{4}{7}\)
\(d\) \(\dfrac{7}{15}:\dfrac{6}{7}=\dfrac{7}{15}\times\dfrac{7}{6}=\dfrac{49}{90}\)
b)1/2*2/3*3/4*4/5*5/6*6/7*7/8*8/9*9/10
=1x2x3x4x5x6x7x8x9
2x3x4x5x6x7x8x9x10
= 1
10
\(a,\dfrac{2}{3}+\dfrac{5}{6}+\dfrac{1}{18}=\dfrac{12}{18}+\dfrac{15}{18}+\dfrac{1}{18}=\dfrac{28}{18}=\dfrac{14}{9}\)
\(b,\dfrac{3}{4}+\dfrac{2}{25}+\dfrac{7}{100}=\dfrac{75}{100}+\dfrac{8}{100}+\dfrac{7}{100}=\dfrac{90}{100}=\dfrac{9}{10}\)
\(c,\dfrac{1}{12}+\dfrac{1}{6}+\dfrac{3}{4}=\dfrac{1}{12}+\dfrac{2}{12}+\dfrac{9}{12}=\dfrac{12}{12}=1\)
a)
`2/3 +5/6+1/18`
`=12/18 +15/18 +1/18`
`=28/18`
`=14/9`
b)
`3/4 +2/25+7/100`
`=75/100 +8/100 +7/100`
`=90/100`
`=9/10`
c)
`1/12 +1/6+3/4`
`=1/12+2/12+9/12`
`=12/12`
`=1`
25/7 - 2 + 3/2 = 43/14
4/5 x 10/3 : 8= 4/5 x 10/3 x 1/8 = 1/3
7/3 + 2/5 : 1/6 = 7/3+ 2/5 x 6 = 7/3 + 12/5 = 71/15
a.
(5/11 + 6/11 ) + ( 1/4 +3/4) + ( 6/25 + 9/25)
= 11/11 + 4/4 + 15/25
= 1 +1 + 3/5
= 2+3/5 = 13/5
b.
( 37/100 + 163/100) + (1/8 + 3/8 ) + 19/4 + 1/2
= 200/100 + 4/8 + ( 19/4 + 2/4)
= 2 + 1/2 + 21/4
= 31/4
a . 3 + 5 6 x 2 3 = 3 + 5 9 = 32 9 b . 10000 - 2575 : 25 = 10000 - 103 = 9897