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\(a,60-3.\left(x-2\right)=51\)
\(3.\left(x-2\right)=60-51\)
\(3.\left(x-2\right)=9\)
c \(x-2=9:3\)
\(x-2=3\)
\(x=3+2\)
\(x=5\)
\(b,541+\left(218-x\right)=725\)
\(218-x=725-541\)
\(218-x=184\)
\(x=218-184\)
\(x=34\)
\(c,3.\left(5x-13\right)=3^4\)
\(3.\left(5x-13\right)=81\)
\(5x-13=81:3\)
\(5x-13=27\)
\(5x=27+13\)
\(5x=40\)
\(x=8\)
\(d,\left(2x-7\right)-\left(x+135\right)=0\)
\(2x-7-x-135=0\)
\(x-142=0\)
\(x=0+142\)
\(x=142\)
=1,4 x\(\dfrac{15}{49}-\) \(\left(\dfrac{4}{5}+\dfrac{2}{3}\right)\) : 2\(\dfrac{1}{5}\)
= \(\dfrac{3}{7}\) - \(\dfrac{22}{15}\) : \(\dfrac{11}{5}\)
= \(\dfrac{3}{7}\) - \(\dfrac{2}{3}\)
= \(-\dfrac{5}{21}\)
( 2\(\dfrac{1}{5}\) + \(\dfrac{3}{5}\) \(\times\) \(x\)) = \(\dfrac{3}{4}\)
\(\dfrac{11}{5}\) + \(\dfrac{3}{5}\)\(x\) = \(\dfrac{3}{4}\)
\(\dfrac{3}{5}\)\(x\) = \(\dfrac{3}{4}\) - \(\dfrac{11}{5}\)
\(\dfrac{3}{5}\)\(x\) = - \(\dfrac{29}{20}\)
\(x\) = -\(\dfrac{29}{12}\)
1) 3/4 : x/6 = 75/100
x/6 = 3/4 : 75/100
x/6 = 1
x = 1*6
x = 6
Câu 6: Bạn xem ở đây: http://olm.vn/hoi-dap/question/615090.html
1.\(\frac{3}{4}:\frac{x}{6}=\frac{75}{100}\) \(\Leftrightarrow\frac{3}{4}.6.\frac{1}{x}=\frac{3}{4}\)
\(\Leftrightarrow\frac{6}{x}=1\)
\(\Leftrightarrow x=\frac{1}{6}\)
Bài làm
\(\frac{x}{3}-\frac{3}{7}+\frac{2}{4}=\frac{31}{140}\)
\(\frac{x}{3}=\frac{31}{140}-\frac{2}{4}+\frac{3}{7}\)
\(\frac{x}{3}=\frac{31}{140}-\frac{70}{140}+\frac{60}{140}\)
\(\frac{x}{3}=\frac{21}{140}\)
\(\frac{x}{3}=\frac{3}{20}\)
=> \(x.20=3.3\)
=> \(x=\frac{3.3}{20}\)
=> \(x=\frac{9}{20}\)
Vậy \(x=\frac{9}{20}\)
# HỌc tốt #
\(\frac{x}{3}-\frac{3}{7}+\frac{2}{5}=\frac{31}{140}\)
\(\frac{x}{3}=\frac{1}{4}\)
x = \(\frac{3}{4}\)
a. 390 - ( x - 7 ) = 169 : 13
390 - ( x - 7 ) = 13
x - 7 = 390 - 13
x - 7 = 377
x = 377 + 7
x = 384.
b. ( x - 140 ) : 7 = 9 - 8 . 3
( x - 140 ) : 7 = đề sai zồi nha, trừ khi nó là số âm.
tick cho m nhaaaaaaaaaaa
a , 390 - ( x - 7 ) = 169 : 13
390 - ( x - 7 ) =12
( x - 7 ) =390-12
( x - 7 ) =378
x=378+7
x=385
b ( x - 140 ) : 7 = 32 - 23 :3
( x - 140 ) : 7 = 9-8:3
( x - 140 ) : 7 = đề sai bạn ơi
c , 3x = 33 . 35
3x=38
=>x=8
d , 2x = 4 . 128
2x =512
2x=210
=> x=10
(X-140)^3:7^2=4^5-3^2.4^3.
=>(x - 140)3:72 = 45 - 32.43
(x - 140)3 : 49 = 448
(x - 140)3 = 21952 = 282
x - 140 = 28
x = 168