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a)\(\left(x-140\right)\)\(\div\)7=27-4-3 =20\(\Rightarrow\) \(\left(x-140\right)\) =20x7=140\(\Rightarrow\) x=0
x - 6 : 2 ( 48 - 24 ) : 2 : 6 - 3 = 0
x - 6 : 2 . 24 : 2 : 6 - 3 = 0
x - 6 - 3 = 0
x - 9 = 0
x = 9
x-6:2 ( 48-24) :2 :6 - 3 = 0
=>x-6:2(48-24):2:6= 3
=> x-6:2(48-24):2 = 18
=> x-6:2(48-24)= 36
=> x- 6:2. 24= 36
=> x- 6: 48= 36
=>x +8=36
=> x= 36-8
=>x= 28
\(x-6:2-\left(48-24\right):2:6-3=0\)
\(x-3-24:2:6-3=0\)
\(x-2-3-3=0\)
\(x-8=0\)
\(x=8\)
vay \(x=8\)
a) 2840 + [(999 - 9x) : 60 ] .24 = 3200
=> [(999-9x) : 60 ] . 24 = 2840 - 3200 = -360
=> (999 - 9x) = \(\frac{-360}{24}=-15\)
=> 9x = 999 - ( - 15) = 999 + 15 = 1014
=> x = \(\frac{1014}{9}=\frac{338}{3}\)
b) (3x - 48) . 6 = 33.22 - 23.32
(3x - 48) . 6 = 27 . 4 - 8 . 9
(3x -48).6 = 36
(3x - 48 = 36 : 6 = 6
3x = 54
x = 54 : 3 =18
t ick cho mik nha
x + 5 . 2 - ( 32 + 16 . 3 : 6 - 15 ) = 0
x + 10 - ( 32 + 8 - 15 ) = 0
x + 10 - 25 = 0
x - 15 = 0
x = 15
x - 6 : 2 - ( 48 - 24 ) : 2 : 6 - 3 = 0
x - 3 - 24 : 2 : 6 - 3 = 0
x - 3 - 2 = 0
x - 5 = 0
x = 5
x + 5 . 2- (32+48:6-15)=0
x+5.2-(32+8-15)=0
x+5.2-25=0
x+10=0+25=25
x=25-10
x=15
cau sau cung tuong tu nhu zay
tự làm nha
nhớ k đó
Đặt tổng trên = A
\(A=\frac{2}{3}+\frac{2}{6}+\frac{2}{12}+\frac{2}{24}+\frac{2}{48}+\frac{2}{98}+\frac{2}{192}\)
\(A.2=\frac{4}{3}+\frac{2}{3}+\frac{2}{6}+\frac{2}{12}+\frac{2}{24}+\frac{2}{48}+\frac{2}{98}\)
\(A.2-A=\left(\frac{4}{3}+\frac{2}{3}+\frac{2}{6}+\frac{2}{12}+\frac{2}{24}+\frac{2}{48}+\frac{2}{98}\right)-\left(\frac{2}{3}+\frac{2}{6}+\frac{2}{12}+\frac{2}{24}+\frac{2}{48}+\frac{2}{98}+\frac{2}{192}\right)\)
\(A=\frac{4}{3}-\frac{2}{192}\)
\(A=\frac{127}{96}\)
\(A=\frac{2}{3}+\frac{2}{6}+\frac{2}{12}+\frac{2}{24}+\frac{2}{48}+\frac{2}{98}+\frac{2}{192}\)
\(2A=\frac{4}{3}+\frac{2}{3}+\frac{2}{6}+\frac{2}{12}+\frac{2}{24}+\frac{2}{48}+\frac{2}{98}\)
\(2A-A=\frac{4}{3}-\frac{2}{192}\)
\(A=\frac{4}{3}-\frac{2}{192}=\frac{127}{96}\)
\(x-3-\left(48-24\right):2+6-3=0\)
\(\Leftrightarrow x-3-24:2+6-3=0\)
\(\Leftrightarrow x-3-12+6-3=0\)
\(\Leftrightarrow x-\left(2+12-6+3\right)=0\)
\(\Leftrightarrow x-12=0\)
\(\Leftrightarrow x=12\)
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