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\(\frac{379-x}{12}=21,7\) Đ/S : 118,6
\(a,\)\(71+65\times4=\frac{x+140}{x}+260\)
\(\Rightarrow71+260=\frac{x-140}{x}+260\)
\(\Rightarrow71=\frac{x-140}{x}\)
\(\Rightarrow71x=x-140\)
\(\Rightarrow71x-x=-140\)
\(\Rightarrow70x=-140\)
\(\Rightarrow x=-2\)
\(b,\)\(y\times\frac{15}{2}-\frac{1}{3}\times\left(\frac{1}{4}+y\right)=90\frac{2}{3}\)
\(\Rightarrow\frac{15y}{2}-\frac{1}{12}-\frac{y}{3}=\frac{272}{3}\)
\(\Rightarrow\frac{90y}{12}-\frac{1}{12}-\frac{4y}{12}=\frac{1088}{12}\)
\(\Rightarrow90y-1-4y=1088\)
\(\Rightarrow86y=1089\)
\(\Rightarrow y=\frac{1089}{86}\)
Trả lời:
\(y\times\frac{15}{2}-\frac{1}{3}\times\left(\frac{1}{4}+y\right)=96\frac{2}{3}\)
\(\Leftrightarrow y\times\frac{15}{2}-\frac{1}{12}-\frac{1}{3}\times y=\frac{290}{3}\)
\(\Leftrightarrow y\times\left(\frac{15}{2}-\frac{1}{3}\right)=\frac{387}{4}\)
\(\Leftrightarrow y\times\frac{43}{6}=\frac{387}{4}\)
\(\Leftrightarrow y=\frac{27}{2}\)
Vậy \(y=\frac{27}{2}\)
\(\frac{x\times\left(96-90\right)}{x+21}=\frac{3}{4}\)
\(\frac{x\times6}{x+21}=\frac{3}{4}\)
\(4x\times6=3x+63\)
\(4x-3x=63:6\)
\(x=10,5\)
\(\frac{4}{3}+x.\frac{2}{3}-\frac{1}{4}=\frac{53}{12}\)
\(x.\frac{2}{3}-\frac{1}{4}=\frac{53}{12}-\frac{4}{3}\)
\(x.\frac{2}{3}-\frac{1}{4}=\frac{37}{12}\)
\(x.\frac{2}{3}=\frac{37}{12}+\frac{1}{4}\)
\(x.\frac{2}{3}=\frac{10}{3}\)
\(x=\frac{10}{3}:\frac{2}{3}\)
\(x=\frac{30}{6}=5\)
Vậy x = 5
mik ko chắc
\(\frac{4}{3}+x.\frac{2}{3}-\frac{1}{4}=4\frac{5}{12}\)
\(\frac{4}{3}+x.\frac{2}{3}=4\frac{5}{12}+\frac{1}{4}\)
\(\frac{4}{3}+x.\frac{2}{3}=\frac{53}{12}+\frac{1}{4}\)
\(\frac{4}{3}+x.\frac{2}{3}=\frac{14}{3}\)
\(x.\frac{2}{3}=\frac{14}{3}-\frac{4}{3}\)
\(x.\frac{2}{3}=\frac{10}{3}\)
\(x=\frac{10}{3}:\frac{2}{3}\)
\(x=5\)
2 x X + 69 x 2 = 69 x 4
2 x X = 69 x (4 - 2)
2 x X = 69 x 2
=> X = 2
2 x (-12) - X = 0
-24 - X = 0
X = -24 - 0
X = -24
96 - 3 x (X + 1) = 42
3 x (X + 1) = 96 - 42
3 x (X +1) = 54
X + 1 = 54 : 3
X + 1 = 17
X = 17 -1
X = 16
chúc bạn học tốt nha
ủng hộ mk với nha
Mk viết dấu nhân là dấu . nhé
a, 2x + 69.2 = 69.4
➡️2x + 138 = 276
➡️2x = 276 - 138
➡️2x = 138
➡️x = 138 ÷ 2 = 69
Vậy x = 69.
b, 2 .( -12) - x = 0
➡️- 24 - x = 0
➡️x = - 24
Vậy x = - 24.
c, 96 - 3( x + 1) = 42
➡️3( x + 1) = 96 - 42
➡️3( x + 1) = 54
➡️x + 1 = 54 ÷ 3
➡️x + 1 = 18
➡️x = 18 - 1 = 17
Vậy x = 17
Còn cái bài tính nhanh đó để mk nghĩ đã nhé.
\(\frac{12}{5}\): x = \(\frac{8}{3}\)
x = \(\frac{8}{3}\): \(\frac{12}{5}\)
x = \(\frac{10}{9}\)
\(\frac{9+x}{12-x}=\frac{4}{3}\)
\(\left(9+x\right)\cdot3=\left(12-x\right)\cdot4\)
\(9\cdot3+x\cdot3=12\cdot4-x\cdot4\)
\(27+x\cdot3=48-x\cdot4\)
\(x\cdot3+x\cdot4=48-27\)
\(x\cdot\left(3+4\right)=48-27\)
\(x\cdot7=21\)
\(x=21:7\)
\(x=3\)
\(\left(9+x\right)\cdot3=4\left(12-x\right)\)
\(27+3x=48-4x\)
\(3x+4x=48-27\)
\(7x=21\)
\(x=21:7\)
\(x=3\)
Lấy 96×12-4=1148
Tim cho mình nha
\(\frac{X+4}{12}=96\)
\(X+4=96\times12\)
\(X+4=1152\)
\(X=1152-4\)
\(X=1148\)
Vậy: X = 1148
HOK TOT