420 : ( x : 39 ) = 105
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a) 49 x ( X – 21 ) = 441 e) X : (12 + 13) = 7
X – 21 = 441:49 X : 25 = 7
X – 21 = 9 X = 7 x 25
X = 21 + 9 X = 175
X = 30
b) 53 x 31 x X = 4929 g) 429 : ( X + 31) = 11
31 x X = 4929 : 53 X + 31 = 429 : 11
31 x X = 93 X + 31 = 39
X = 93 : 31 ’ X = 39 – 31
X = 3 X = 8
c) 61 x (126 : X ) = 1281 h) 1 615 : (X x 19) = 17
126 : X = 1281 : 61 X x 19 = 1 615 : 17
126 : X = 21 X x 19 = 95
X = 126 : 21 X = 95 : 19
X = 6 X = 5
d) 79 x ( X : 23 ) = 316 i) 420 : ( X : 39 ) = 105
X : 23 = 316 : 79 X : 39 = 420 : 105
X : 23 = 4 X : 39 = 4
X = 4 x 23 X = 4 x 39
X = 92 X = 156
420:(x:39)=105
x:39=420:105
x:39=4
x = 39x4
x =156
A : Hế lô,goắt ì do nêm ?
B : What ?
A : Goắt là cái gì ? diu min do nêm ì goắt
B : What are you saying ?
A : Do nêm ì goắt a diu xây inh
B : Wtf
Bài làm:
\(\frac{215}{300}=\frac{43}{60}\)
\(\frac{1200}{2010}=\frac{40}{67}\)
\(\frac{105}{420}=\frac{1}{4}\)
\(\frac{125}{420}=\frac{25}{84}\)
#Học_tốt
\(\dfrac{215}{300}\) = \(\dfrac{215:5}{300:5}\) = \(\dfrac{43}{60}\)
\(\dfrac{1200}{2010}\) = \(\dfrac{1200:30}{2010:30}\) = \(\dfrac{40}{67}\)
\(\dfrac{105}{420}\) = \(\dfrac{105:105}{420:105}\) = \(\dfrac{1}{4}\)
\(\dfrac{125}{420}\) = \(\dfrac{125:5}{420:5}\) = \(\dfrac{25}{84}\)
a)
160 : (4 × 8) = 160 : 32 = 5
160 : 4 : 8 = 40 : 8 = 5
Vậy 160 : (4 × 8) = 160 : 4 : 8.
96 : (3 × 8) = 96 : 24 = 4
96 : 3 : 8 = 32 : 8 = 4
Vậy 96 : (3 × 8) = 96 : 3 : 8.
105 : (5 × 7) = 105 : 35 = 3
105 : 5 : 7 = 21 : 7 = 3
Vậy 105 : (5 × 7) = 105 : 5 : 7.
Nhận xét: a : (b × c) = a : b : c
b)
270 : (9 × 6) = 270 : 9 : 6 = 30 : 6 = 5
420 : (7 × 3) = 420 : 7 : 3 = 60 : 3 = 20
144 : (2 × 8) = 144 : 2 : 8 = 72 : 8 = 9
420:(105-(27+10)x(27-24)
=420:(105-37x3)
=420:(105-111)
=420:(-6)
=-70
a - 420 : ( x : 39 ) = 105
⇒ x : 39 = 420 : 105
⇒ x : 39 = 4
⇒ x = 4 * 39
⇒ x = 156
a) -420 :(x:39)=105
x:39=-420 : 105
x : 39=\(\dfrac{-14}{5}\)
x=\(\dfrac{-546}{5}\)
420 : (\(x\) : 39) = 105
\(x\) : 39 = 420 : 105
\(x\) : 39 = 4
\(x\) = 4 x 39
\(x\) = 156
\(420:\left(x:39\right)=105\)
\(x:39=420:105\)
\(x:39=4\)
\(x=39\times4\)
\(x=156\)