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\(12371-5428+1429=\left(12371+1429\right)-5428=13800-5428=8372\\ 36,44\times99+36+0,4=36,4\times\left(100-1\right)+\left(36+0,4\right)=36,4\times100-36,4+36,4=3640+0=3640\)
Bài 1:
\(\dfrac{36}{21}-\dfrac{15}{20}\)
\(=\dfrac{12}{7}-\dfrac{3}{4}\)
\(=\dfrac{48}{28}-\dfrac{21}{28}\)
\(=\dfrac{27}{28}\)
\(----\)
\(\dfrac{63}{45}-\dfrac{20}{25}\)
\(=\dfrac{63}{45}-\dfrac{4}{5}\)
\(=\dfrac{63}{45}-\dfrac{36}{45}\)
\(=\dfrac{27}{45}=\dfrac{3}{5}\)
Bài 2:
\(\dfrac{3}{5}+\dfrac{3}{16}+\dfrac{13}{16}\)
\(=\dfrac{3}{5}+\left(\dfrac{3}{16}+\dfrac{13}{16}\right)\)
\(=\dfrac{3}{5}+1\)
\(=\dfrac{3}{5}+\dfrac{5}{5}\)
\(=\dfrac{8}{5}\)
`36/21-15/20`
`=12/7-3/4`
`=48/28-21/28`
`=27/28`
__
`63/45-20/25`
`=7/5-4/5`
`=3/5`
__
`2)`
`3/5+3/16+13/16`
`=3/5+(3/16+13/16)`
`=3/5+16/16`
`=3/5+1`
`=3/5+5/5`
`=8/5`
`#QiN`
35 x 36 + 36 x 63 + 36 : 1/2
= 35 x 36 + 36 x 63 + 36 x 2
= 36 x ( 35 + 63 + 2 )
= 36 x 100
= 3 600
/HT\
=35x36+36x63+36x2 (nếu bn ko hiểu tại sao mik nhân 2 thì: 36 : 1/2 = 36 x 2/1= 36 x2) =35x(35+63+2) = 35x100=3500
\(\dfrac{1}{10}+\dfrac{4}{20}+\dfrac{9}{30}+\dfrac{16}{40}+\dfrac{25}{50}+\dfrac{36}{60}+\dfrac{49}{70}+\dfrac{64}{80}+\dfrac{81}{90}\)
\(=\dfrac{1}{10}+\dfrac{1}{5}+\dfrac{3}{10}+\dfrac{2}{5}+\dfrac{1}{2}+\dfrac{3}{5}+\dfrac{7}{10}+\dfrac{4}{5}+\dfrac{9}{10}\)
\(=\left(\dfrac{1}{10}+\dfrac{3}{10}+\dfrac{7}{10}+\dfrac{9}{10}\right)+\left(\dfrac{1}{5}+\dfrac{2}{5}+\dfrac{3}{5}+\dfrac{4}{5}\right)+\dfrac{1}{2}\)
\(=2+2+\dfrac{1}{2}\)
\(=4+\dfrac{1}{2}\)
\(=\dfrac{8}{2}+\dfrac{1}{2}=\dfrac{9}{2}\)
36 x 99 + 36 +0,4
=36 x 99 + 36 x1 +0,4
= 36 x ( 99 + 1 ) + 0,4
= 36 x 100 + 0,4
= 3600 + 0,4
= 3600,4
36 x 47 + 33 x 36 + 9 x 80
= 36 x (47 + 33) + 9 x 80
= 36 x 80 + 9 x 80
= 80 x (36 + 9)
= 80 x 45
=3600
= 235 x ( - 36 ) + ( - 335 ) x ( - 36 )
= ( - 36 ) x [ 235 + ( - 335 )]
= ( - 36 ) x ( - 100 )
= 3600