Tìm x:
A.X × 37 =1135
B.( X × 3 ) × 247 = 40755
C.57316 : ( X - 8 ) = 623
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Bài 13 : Tìm x
30240 : x = 42
x = 30240 : 42
x = 720
X x 12 = 2412
X = 2412 : 12
X = 201
57316 : ( X - 8 ) = 623
X - 8 = 57316 : 623
X - 8 = 92
X = 92 + 8
X = 100
( X + 3 ) x 247 = 10755
X + 3 = 10755 : 247
X + 3 = 10755/247
X = 10755/247 - 3
X = 10014/247
X x 37 = 1135
X = 1135 : 37
X = 1135/37
25 x X = 9100
X = 9100 : 25
X = 364
Bài 13
1.720 2.201 3.100 4.162 5. 1135/37 6.364
bài 14
( 367*584+12345 ) * ( 3570: 357 - 10)
= ( 367*584+ 12345 ) * ( 10-10 )
= ( 367*584+12345 ) * 0
= 0
(367*584+12345)*(3570:357-10)
=(367*584+12345)*(10-10)
=(367*584+12345)*0
=0
a: \(\Leftrightarrow x\cdot12.71=1.269\)
hay x=1269/12710
a: \(\Leftrightarrow x\cdot12.71=1.269\)
hay x=1269/12710
30240 : x = 42
x = 30240 : 42
x = 720
[ x + 3] x 247 = 40755
x + 3 = 40755 : 247
x + 3 = 165
x = 165 - 3
x = 162
57316 : [ x - 8 ] = 623
x-8 = 57316 : 623
x-8 = 92
x = 92 + 8
x = 100
x x 37 = 1147
x = 1147 : 37
x = 31
30240 : x = 42
x= 30240 : 42
x=720
(x + 3) x 247 = 40755
x + 3 = 40755 : 247
x + 3 = 165
x = 165 - 3
x = 162
57316 : (x - 8 )= 623
x- 8 = 57316 : 623
x- 8 = 92
x = 92 + 8
x = 100
X x 37 = 1147
X = 1147 : 37
X = 31
\(\left(x-1\right)^3-\left(\dfrac{2}{2023}-\dfrac{7}{247}+\dfrac{1}{8}\right)=\dfrac{7}{247}-\dfrac{2}{2023}\)
\(\Rightarrow\left(x-1\right)^3-\dfrac{2}{2023}+\dfrac{7}{247}-\dfrac{1}{8}=\dfrac{7}{247}-\dfrac{2}{2023}\)
\(\Rightarrow\left(x-1\right)^3=\dfrac{7}{247}-\dfrac{7}{247}-\dfrac{2}{2023}+\dfrac{2}{2023}+\dfrac{1}{8}\)
\(\Rightarrow\left(x-1\right)^3=\dfrac{1}{8}\)
\(\Rightarrow\left(x-1\right)^3=\left(\dfrac{1}{2}\right)^3\)
\(\Rightarrow x-1=\dfrac{1}{2}\)
\(\Rightarrow x=\dfrac{1}{2}+1\)
\(\Rightarrow x=\dfrac{3}{2}\)
Lời gải:
$(x-1)^3=\frac{7}{247}-\frac{2}{2023}+\frac{2}{2023}-\frac{7}{247}+\frac{1}{8}=\frac{1}{8}$
$x-1=\frac{1}{2}$
$x=\frac{1}{2}+1=\frac{3}{2}$
a: =>x=1135:37=1135/37
b: =>3x=165
hay x=55
c: =>x-8=92
hay x=100
\(a,x=1135:37=30\left(dư.27\right)\\ b,x\times3=40755:247=165\\ x=165:3=55\\ c,x-8=57316:623=92\\ x=92+8=100\)