13/15-(13/21=x)*7/12=7/10
Tìm x biết : 13/15 - (13/21+x)*7/12 = 7/10
Tìm x biết:
13/15 - ( 13/21 + x ) . 7/12 = 7/10.
13/15 - (13/21 + x) . 7/12 = 7/10
=> (13/21 + x). 7/12 = 13/15 - 7/10
=> (13/21 + x) . 7/12 = 1/6
=> 13/21 + x = 1/6 : 7/12
=> 13/21 + x = 2/7
=> x = 2/7 - 13/21
=> x = -1/3
13/15-(13/21+x)*7/12=7/10 . Các pn giải hộ mk với!!
\(\frac{13}{15}-\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{7}{10}\)
\(\frac{13}{15}-\left(\frac{13}{21}.\frac{7}{12}+\frac{7}{12}.x\right)=\frac{7}{10}\)
\(\frac{13}{15}-\left(\frac{13}{36}+\frac{7}{12}.x\right)=\frac{7}{10}\)
\(\frac{13}{15}-\frac{13}{36}-\frac{7}{12}.x=\frac{7}{10}\)
\(-\frac{7}{12}.x=\frac{7}{10}-\frac{13}{15}+\frac{13}{36}\)
\(-\frac{7}{12}.x=\frac{126}{180}-\frac{156}{180}+\frac{65}{180}\)
\(-\frac{7}{12}.x=\frac{7}{36}\)
\(x=\frac{7}{36}:\left(-\frac{7}{12}\right)\)
\(x=\frac{7}{36}.\frac{-12}{7}\)
\(x=\frac{-1}{3}\)
(x+1/4-1/3):(2+1/6-1/4)=7/46
13/15-(13/21+x).7/12=7/10
Tính
a, -(-5)-(+7)+(+3)+(-8)
b, -(-15)-|-10|+|-9|-|5|
c, 14-(-13)-(17)+(-12)
d, -|-14| + |-10| - (-12) + (-8)
e, -(-11) + (-15) + (13) - 21
Bài 2 tìm x
1, -x + 20 = - (-15) - (8) + 13
2, -(-10) + x = -13 + (-9) + (-6)
3, 8-(-12) + 10 = - (-14) - x
4. - (+12) + (-x) - (-3) = 5 - (-7)
5. 14 - x + (-10) = - (-9) + (+15)
6. 12 - (-17) + (-3) = -5 + x
7. X - (-19) - (+32) = 14 - (+16)
8. X - |-15| - |7| = - (-9) + |-5|
9. 15 - x + 17 = 13 - (-21)
10. - |-5| - (-x) +4 = 3 - (-25)
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bài1
a,
5 - 7 + 3 +(-8)
= -2 + 3 + ( - 8)
= 1 + (-8)= -7
a; - (-5) - (+7) + (+3) + (-8)
= 5 - 7 + 3 - 8
= (5 + 3 - 8) - 7
= (8 - 8) - 7
= 0 - 7
= - 7
a, \(\frac{13}{15}-\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{7}{10}\)
\(\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{13}{15}-\frac{7}{10}\)
\(\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{26}{30}-\frac{21}{30}\)
\(\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{1}{6}\)
\(\frac{13}{21}+x=\frac{1}{6}:\frac{7}{12}\)
\(\frac{13}{21}+x=\frac{1.12}{6.7}\)
\(\frac{13}{21}+x=\frac{2}{7}\)
\(x=\frac{2}{7}-\frac{13}{21}\)
\(x=\frac{6}{21}-\frac{13}{21}\)
\(x=\frac{-1}{3}\)
\(\frac{13}{15}-\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{7}{10}\)
\(\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{13}{15}-\frac{7}{10}\)
\(\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{1}{6}\)
\(\frac{13}{21}+x=\frac{1}{6}:\frac{7}{12}\)
\(\frac{13}{21}+x=\frac{2}{7}\)
\(x=\frac{2}{7}-\frac{13}{21}\)
\(x=-\frac{1}{3}\)
Tìm x
a) ( x + 1/4 -1/3 ) : ( 2+ 1/6 -1/4 ) = 7 /46
b) 13/15- ( 13/21 + x ) . 7 /12 =7/10
a) \(\left(x+\frac{1}{4}-\frac{1}{3}\right):\left(2+\frac{1}{6}-\frac{1}{4}\right)=\frac{7}{46}\)
\(\left(x-\frac{1}{12}\right):\left(2-\frac{1}{12}\right)=\frac{7}{46}\)
\(\left(x-\frac{1}{12}\right):\frac{23}{12}=\frac{7}{46}\)
\(x-\frac{1}{12}=\frac{7}{46}.\frac{23}{12}\)
\(x-\frac{1}{12}=\frac{7}{24}\)
\(x=\frac{7}{24}+\frac{1}{12}\)
\(x=\frac{3}{8}\)
Vậy \(x=\frac{3}{8}\)
b) \(\frac{13}{15}-\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{7}{10}\)
\(\frac{13}{15}-\left(\frac{13}{21}+x\right)=\frac{7}{10}:\frac{7}{12}\)
\(\frac{13}{15}-\left(\frac{13}{21}+x\right)=\frac{7}{10}.\frac{12}{7}\)
\(\frac{13}{15}-\left(\frac{13}{21}+x\right)=\frac{6}{5}\)
\(\frac{13}{21}+x=\frac{13}{15}-\frac{6}{5}\)
\(\frac{13}{21}+x=\frac{-1}{3}\)
\(x=\frac{-1}{3}-\frac{13}{21}\)
\(x=\frac{-20}{21}\)
Vậy \(x=\frac{-20}{21}\)
\(\frac{13}{15}-\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{7}{10}\)
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Tìm X, biết
a,(x+1/4-1/3):(2+1/6-1/4)=7/46
b, 13/15-(13/21+x).7/12=7/10