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9/4 x 6/5 + 9/4 x 14/5 - 9/4
= 9/4 x ( 6/5 + 14/5 -1 )
= 9/4 x 3
= 27/4
đây đáp án đây
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\(\dfrac{9}{10}\times2+3\times\dfrac{9}{10}+\dfrac{9}{10}:\dfrac{1}{5}\)
\(=\dfrac{9}{10}\times2+\dfrac{9}{10}\times3+\dfrac{9}{10}\times5\)
\(=\dfrac{9}{10}\times\left(2+3+5\right)\)
\(=\dfrac{9}{10}\times10\)
\(=\dfrac{90}{10}\)
\(=9\)
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( 11 x 9 - 100 +1 ) x ( 1 x 2 x ... x10 ) = (99 + 1 - 100) x 1 x 2 x .... x 10
= 0 x 1 x 2 x ....... x 10
= 0
Ta có
(11x9 -100+1)x (1x2x3x..x100)
= 0x ( 1x2x3x..x100)
=0
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8367-x : 9 =4395
x:9 =8367-4395
x:9 =3972
x =3972*9
x =35748
Hok tốt^^
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a) 2/5 x 1/6 x 1/9 =1/5x1/9=1/45
b) 2/5 x 1/6 : 1/9 = 1/5x9=9/5
c)2/5 : 1/6 x 1/9 =2/5x6x1/9=12/5x1/9=12/45
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\(\frac{3}{8}\cdot\frac{4}{15}\cdot\frac{12}{9}=\frac{3.4.3.4}{2.4.3.5.3.3}=\frac{2}{15}\)
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(x+1)+(x+2)+(x+3)+(x+4)+...+(x+9)+(x+10)=2015
=>x.10+(1+2+3+4+...+9+10)=2015
=>x.10+55=2015
=>x.10 =2015-55
=>x.10 =1960
=>x =1960:10
=>x =196
Vậy x=196
bật mí 1 tý để suy nghĩ làm tiếp nè
10 x X + (1+2+3+...+10)=2015
2021x9+2021=2021x(9+1)
=2021x10
=20210
2021 x 9 + 2021 = 18189 + 2021
= 20200