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a) 5.(x-20) = 35
(x-20) = 35:5
x-20 = 7
x = 27
b) (x+125) -301 = 56
x+125 -301 = 56
x - 176 = 56
x = 56 +176
x= 232
c) 215 + (x-21):2 = 235
(x-21):2 = 235 - 215
(x-21):2 = 20
x-21 = 20 .2
x-21 = 40
x = 61
d) (x:23 +45) .67 = 8911
(x:23 +45) = 8911 : 67
x:23+45 = 133
x:23 = 133-45
x:23 = 88
x = 88.23
x = 2024
a) 5.(x - 20) = 35
⇒ x - 20 = 35 : 5
⇒ x - 20 = 7
⇒ x = 7 + 20
⇒ x = 27
b) (x + 125) - 301 = 56
⇒ x + 125 = 56 + 301
⇒ x + 125 = 357
⇒ x = 357 - 125
⇒ x = 232
c) 215 + (x - 21) : 2 = 235
⇒ (x - 21) : 2 = 235 - 215
⇒ (x - 21) : 2 = 20
⇒ x - 21 = 20 x 2
⇒ x - 21 = 40
⇒ x = 21 + 40
⇒ x = 61
d) (x : 23 + 45).67 = 8911
⇒ x : 23 + 45 = 8911 : 67
⇒ x : 23 + 45 = 133
⇒ x : 23 = 133 - 45
⇒ x : 23 = 88
⇒ x = 88 x 23
⇒ x = 2024
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\(\left(2.x-4\right).\left(x-1\right)=0\)
\(\Rightarrow\orbr{\begin{cases}2.x-4=0\\x-1=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=2\\x=1\end{cases}}\)
\(\orbr{\begin{cases}2X-4=0\\X-1=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}X=2\\X=1\end{cases}}\)
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x * 1,2 - 3,45 = 4,68
x * 1,2 = 4,68 + 3,45
x * 1,2 = 8,13
x = 8,13 : 1,2
x = 6,775.
~ Happy New Year ~
x*1,2-3,45=4,68
x*1,2 =4,68+3,45
x*1,2 =8,13
x =8,13/1,2
=> x=6,775
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\(x\div10+x\times3,9=4,8\)
\(\Rightarrow x\times\frac{1}{10}+x\times3,9=4,8\)
\(\Rightarrow x\times\left(\frac{1}{10}+3,9\right)=4,8\)
\(\Rightarrow x\times4=4,8\)
\(\Rightarrow x=4,8\div4\)
\(\Rightarrow x=1,2\)
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a. 12,5 - \(x\) = \(x\) + 12
\(x\) + 12 + \(x\) = 12,5
\(x\) x 1 + \(x\) x 1 = 12,5 - 12
\(x\) x (1 + 1) = 0,5
\(x\) x 2 = 0,5
\(x\) = 0,5 : 2
\(x\) = 0,25
b, 8 \(\times\) \(x\) + 3 \(\times\) \(x\) + 2 \(\times\) \(x\) = 20
\(x\) \(\times\) (8 + 3 + 2) =20
\(x\) \(\times\) 13 = 20
\(x\) = 20 : 13
\(x\) = \(\dfrac{20}{13}\)
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\(\frac{2}{3}\cdot x=\frac{1}{4}\)
\(\Rightarrow x=\frac{1}{4}:\frac{2}{3}\Rightarrow x=\frac{3}{8}\)
Vậy x = \(\frac{3}{8}\)
Sao cảm thấy mấy bài toán lớp 5 easy luôn đấy -_-
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\(a,\left(x+\frac{1}{2}\right)+\left(x+\frac{1}{4}\right)+\left(x+\frac{1}{8}\right)+\left(x+\frac{1}{16}\right)=1\)
\(\Leftrightarrow x+\frac{1}{2}+x+\frac{1}{4}+x+\frac{1}{8}+x+\frac{1}{16}=1\)
\(\Leftrightarrow\left(x+x+x+x\right)+\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)=1\)
\(\Leftrightarrow4\times x+\frac{15}{16}=1\)
\(\Leftrightarrow4\times x=1-\frac{15}{16}\)
\(\Leftrightarrow4\times x=\frac{1}{16}\)
\(\Leftrightarrow x=\frac{1}{16}\div4\)
\(\Leftrightarrow x=\frac{1}{64}\)
\(b,x-\frac{20}{11.13}-\frac{20}{13.15}-...-\frac{20}{53.55}=\frac{3}{11}\)
\(\Leftrightarrow x-\left(\frac{20}{11.13}+\frac{20}{13.15}+...+\frac{20}{53.55}\right)=\frac{3}{11}\)
\(\Leftrightarrow x-\left[715\times\left(\frac{1}{11}-\frac{1}{13}-\frac{1}{13}+...+\frac{1}{55}\right)\right]=\frac{3}{11}\)
\(\Leftrightarrow x-\left[715\times\left(\frac{1}{11}-\frac{1}{55}\right)\right]=\frac{3}{11}\)
\(\Leftrightarrow x-\left[715\times\frac{4}{55}\right]=\frac{3}{11}\)
\(\Leftrightarrow x-52=\frac{3}{11}\)
\(\Leftrightarrow x=\frac{3}{11}+52\)
\(\Leftrightarrow x=\frac{575}{11}\)
\(1,2:x.4=20\)
\(1,2:x=20:4\)
\(1,2:x=5\)
\(x=1,2:5\)
\(x=\)( bạn tự tính)
1,2 : X x 4 = 20
1,2 : X = 20 : 4
1,2 : X = 5
X = 1,2 : 5
X = 0,24
Chúc bạn học tốt nha .