86 + 357 + 14
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\(x:\dfrac{1}{7}=\dfrac{1}{4}\\ \Rightarrow x=\dfrac{1}{4}.\dfrac{1}{7}\\ \Rightarrow x=\dfrac{1.1}{4.7}\\ \Rightarrow x=\dfrac{1}{28}\)
a) 86 + 357 + 14
= ( 86 + 14 ) + 357
= 100 + 357
= 457
b) 72 + 69 + 128
= ( 72 + 128 ) + 69
= 200 + 69
= 269
c) 25 . 5 . 4 . 27
= ( 25 . 4 ) . 5 . 27
= 100 . 5 . 27
= 500 . 27
= 13500
d) 28 . 64 + 28 . 36
= 28 . ( 64 + 36 )
= 28 . 100
= 2800
a)
\(86+357+14=\left(86+14\right)+357=100+357=457\)
b)
\(72+69+128=\left(72+128\right)+69=200+69=269\)
c)
\(25.5.4.27.2=\left(25.4\right).\left(5.2\right).27=100.10.27=27000\)
d)
\(28.64+28.36=28.\left(64+36\right)=28.100=2800\)
a) \(7,\left(3\right)=7\frac{3}{9}=\frac{66}{9}=\frac{22}{3}\)
b) \(2,\left(34\right)=2\frac{34}{99}=\frac{232}{99}\)
c) \(0,\left(357\right)=\frac{357}{999}=\frac{119}{333}\)
d) \(1,2\left(3\right)=\frac{1}{10}.12,\left(3\right)=\frac{1}{10}.12\frac{3}{9}=\frac{1}{10}.\frac{37}{3}=\frac{37}{30}\)
220=1048576
1+0+4+8+5+7+6=31
31:3 dư 1
suy ra :220 :3 sẽ có dư là 1
a. x : 13/16 = 5/-8
x : 13/16 = -5/8
x = -5/8 . 13/16
x = -65/128
b.
x . \(\dfrac{-14}{28}\) = \(\dfrac{6}{-9}\) - \(\dfrac{2}{15}\)
x . \(\dfrac{-14}{28}\) = \(\dfrac{-9}{6}\) - \(\dfrac{2}{15}\)
x . \(\dfrac{-14}{28}\) = \(\dfrac{-49}{30}\)
x = \(\dfrac{-49}{30}\) : \(\dfrac{-14}{28}\)
x = \(\dfrac{-49}{30}\) . \(\dfrac{-28}{14}\)
x = \(\dfrac{-49}{15}\)
86 + 357+ 14
= (86 + 14 ) + 357
= 100 + 357
= 457
= 357 + 86 + 14
= 357+ 100
=457