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0,25 x 400 x 8 x 0,125
= ( 0,25x400 )x ( 8x0,125 )
=100x1
=100
0,25 x 400 x 8 x 0,125
=(0,25 x 400) x (8 x 0,125)
=100 x 1
=100
Ai tích mình mình tích lại cho
a,
72 : ( 3*x ) = 4
x = 72 : 4
x = 18
x = 18 : 3
x = 6 .
b,
400 : ( x*5 ) = 8
x = 400 : 8
x = 50
x = 50 : 5
x = 10 .
ủng hộ ! Nobita
\(a,72:\left(3\times x\right)=4\)
\(3\times x=72:4\)
\(3\times x=18\)
\(x=18:3\)
\(x=6\)
\(b,400:\left(x\times5\right)=8\)
\(x\times5=400:8\)
\(x\times5=50\)
\(x=50:5\)
\(x=10\)
a) (x-20):11=72
x - 20 = 72 x 11
x - 20 = 792
x = 792 + 20
x = 812
b) 6:x + 18:x =8
( 6 + 18 ) : x = 8
24 : x = 8
x = 24 : 8
x = 3
a) (x-20) :11=72
x-20 =72 x 11
x-20 =792
x =792+20
x =1012
b) 6:x + 18:x=8
(6+18):x =8
24 :x =8
x =24:8
x =3
nhé!!!
a)\(8-\frac{3}{5}=\frac{40}{5}-\frac{3}{5}=\frac{37}{5}\)
b)\(\frac{24}{15}\times\frac{56}{72}\times\frac{10}{14}=\frac{13440}{15120}=\frac{8}{9}\)
c)\(\frac{32}{48}\times\frac{35}{21}\times\frac{63}{14}\times\frac{9}{30}=\frac{2}{3}\times\frac{5}{3}\times\frac{9}{2}\times\frac{3}{10}=\frac{270}{180}=\frac{3}{2}\)
d)\(7-\frac{72}{48}\times\frac{56}{60}-3=7-\frac{3}{2}\times\frac{14}{15}-3\)
\(=7-\frac{7}{5}-3\)
\(=\frac{35}{5}-\frac{7}{5}-\frac{15}{5}\)
\(=\frac{13}{5}\)
#H
(Sai thì sửa)
\(\dfrac{3\times4\times2\times14}{7\times4\times6}=\dfrac{3\times4\times2\times2\times7}{7\times4\times6}=\dfrac{6\times4\times2\times7}{7\times4\times6}=2\\ \dfrac{21\times18\times3\times4}{2\times6\times7\times9}=\dfrac{3\times7\times9\times2\times3\times2\times2}{2\times6\times7\times9}=\dfrac{3\times2}{1}=6\)
a/\(\left(\dfrac{7}{9}\times\dfrac{9}{7}\right)\times\dfrac{25}{28}\)
\(=1\times\dfrac{25}{28}\)
\(=\dfrac{25}{28}\)
b/\(\dfrac{4}{7}\times\dfrac{17}{18}\times\dfrac{7}{4}\times\dfrac{18}{17}\)
\(=\left(\dfrac{4}{7}\times\dfrac{7}{4}\right)\times\left(\dfrac{17}{18}\times\dfrac{18}{17}\right)\)
\(=1\times1\)
\(=1\)
x : 5/7=7/6 x x 4 = 1/12
x =7/6 x 5 /7 x = 1/12 : 4
x = 5/6 x = 1/48
a ) x.18:4= 72.0,25
x.18:4= 18
x.18= 18.4
x.18=72
x= 72:18
x=4
b) x.0,125= 3,6+2,8:8
x.0,125= 3,6+0,35
x.0,125=3,95
x= 3,95: 0,125
x= 31,6