a, Tìm y: y x 20 + 16 x y = 972 |
X × 20 + 16 × X = 972
X x 20 + 16 x X = 972
X x (20+16) = 972
X x 36 = 972
X= 972 :36
X= 27
Vậy X = 27
X x 20 +16 x X =972
X x (20+16)=972
X x 36 = 972
X = 27
VẬY X=27
X x 20 + 16 x X = 972
X x (20 + 16) = 972
X x 36 = 972
X = 972 : 36
X = 27
Tìm y:
y x 3,2 + y x 6,8 = 125,68-99
\(\Rightarrow y\times\left(3,2+6,8\right)=26,68\\ \Rightarrow y\times10=26,68\\ \Rightarrow y=26,68:10\\ \Rightarrow y=2,668\)
Bài 4 tìm x
a ) X 36 = 972
b ) ( X - 47 ) x 21 = 840
c ) X x 22 + X x 50 = 504
d ) 254 : x = 14 ( dư 16 )
e ) 729 : X = 81
f ) y x 15 + y x 13 = 560 x 45
giúp em với !
Có ngay nè e
a. X x 36 =972
X = 972 : 36
X = 27
b. ( X - 47) x 21 = 840
X - 47 = 840 : 21
X - 47 = 40
X = 40 + 47
X = 87
c. X x 22 + X x 50 = 504
X x ( 22 + 50) = 504
X x 72 = 504'
X = 504 : 72
X = 7
d.254 : x = 14 ( dư 16)
X = ( 254 - 16) : 14
X = 238 : 14
X = 17
e. 729 : X = 81
X = 729 : 81
X = 9
f. y x 15 + y x 13 = 560 x 45
y x 15 + y x 13 = 25 200
y x ( 15 + 13 ) = 25 200
y x 28 = 25 200
y = 25 200 : 28
y = 900
Có sai ở đâu thông cảm cho a nhé, Dài quá e ạ
tìm y:y + 23 = 6 x y +17
y + 23 = 6 x y + 17
=> 5 x y = 6
=> y = 6/5
2/ Tìm y:
y + \(\dfrac{1}{3}\) x 4 = 12 \(\dfrac{2}{5}\) + y = \(\dfrac{12}{35}\) x \(\dfrac{14}{9}\)
\(y=12-\left(\dfrac{1}{3}\times4\right)=12-\dfrac{4}{3}=\dfrac{32}{3}\)
\(y=\left(\dfrac{12}{35}\times\dfrac{14}{9}\right)-\dfrac{2}{5}=\dfrac{8}{15}-\dfrac{2}{5}=\dfrac{2}{15}\)
a) \(y+\dfrac{1}{3}\times4=12\)
\(y+\dfrac{1}{3}=12:4\)
\(y+\dfrac{1}{3}=3\)
\(y=3-\dfrac{1}{3}\)
\(y=\dfrac{8}{3}\)
b) \(\dfrac{2}{5}+y=\dfrac{12}{35}\times\dfrac{14}{9}\)
\(\dfrac{2}{5}+y=\dfrac{8}{15}\)
\(y=\dfrac{8}{15}-\dfrac{2}{5}\)
\(y=\dfrac{2}{15}\)
Tìm Y:
Y x 4 x 25 = 388600
Tìm y:Y x 4 = 32 x 8
Tìm y:
y x 7 = 5,6 %
\(y\times7=5,6\%\)
\(\Leftrightarrow y\times7=\dfrac{5,6}{100}\)
\(\Leftrightarrow y=\dfrac{5,6}{100}:7=\dfrac{1}{125}\)
tìm x: a. 3^9:3^6+ x =89 b. 7^ x =48 c. 16+2^ x=32 d. 2^x+1=64 e. 3^x+1+3^x=972
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