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\(A=\left(2+\dfrac{1}{5}-\dfrac{2}{3}\right)+\left(3-\dfrac{4}{5}+\dfrac{2}{3}\right)-\left(1+\dfrac{7}{5}-\dfrac{3}{5}\right)\)
\(A=2+\dfrac{1}{5}-\dfrac{2}{3}+3-\dfrac{4}{5}+\dfrac{2}{3}-1-\dfrac{7}{5}+\dfrac{3}{5}\)
\(A=\left(2+3-1\right)+\left(\dfrac{1}{5}-\dfrac{4}{5}-\dfrac{7}{5}+\dfrac{3}{5}\right)+\left(-\dfrac{2}{3}+\dfrac{2}{3}\right)\)
\(A=4+\dfrac{-7}{5}+0\)
\(A=\dfrac{20}{5}+\dfrac{-7}{5}=\dfrac{13}{5}\)
1 viết lại câu
1. oftem/I/the/museum/saturday/visit/on
i often visit the museum on saturday
2.3 year/my/died/ago/neighbor/because/accident/got/an
my neighbor died 3 years ago becausehe got an accident
3.cooking/sister/in my/is/dinner/kitchen/the
my sister is cooking dinner in the kitchen
4.donot/jane/usually/breakast/morning/in the/have
jane doesn't usually have breakfast in the morning
5.tired/I/when/cycle/to/school/am/always/I
i am laways tired when i cycle to school
6.reused/recycle/we/bottles/can?
can we recycle reused bottles
a: =-5/7(2/11+9/11)+12/7
=12/7-5/7
=7/7=1
b: \(=\dfrac{-12}{56}+\dfrac{35}{56}-\dfrac{28}{56}=\dfrac{-5}{56}\)
c: \(=\dfrac{1}{4}-\dfrac{5}{13}+\dfrac{2}{11}-\dfrac{8}{13}+\dfrac{3}{4}\)
=1-1+2/11
=2/11
d: \(=\dfrac{21}{31}+\dfrac{-16}{7}+\dfrac{44}{53}+\dfrac{10}{31}+\dfrac{9}{53}\)
=1+1-16/7
=-2/7
e: \(=\dfrac{\dfrac{4}{36}-\dfrac{30}{36}-\dfrac{144}{36}}{\dfrac{21}{36}-\dfrac{1}{36}-\dfrac{360}{36}}=\dfrac{-160}{-340}=\dfrac{8}{17}\)
\(a,x-\dfrac{3}{4}=\dfrac{1}{7}\\ x=\dfrac{1}{7}+\dfrac{3}{4}\\ x=\dfrac{25}{28}\\ b,x+\dfrac{7}{5}=\dfrac{9}{8}.\dfrac{4}{27}\\ x+\dfrac{7}{5}=\dfrac{1}{6}\\ x=\dfrac{1}{6}-\dfrac{7}{5}\\ x=\dfrac{-37}{30}\\ c,\dfrac{2}{5}-\dfrac{3}{7}=\dfrac{x}{70}\\ \dfrac{-1}{35}=\dfrac{x}{70}\\ \dfrac{-2}{70}=\dfrac{x}{70}\\ x=-2\\ d,\dfrac{2}{9}-\dfrac{7}{8}.x=1\\ \dfrac{7}{8}.x=\dfrac{2}{9}-1\\ \dfrac{7}{8}.x=\dfrac{-7}{9}\\ x=\dfrac{-7}{9}:\dfrac{7}{8}\\ x=\dfrac{-8}{9}\)
\(a,x-\dfrac{3}{4}=\dfrac{1}{7}\)
\(\Rightarrow x=\dfrac{1}{7}+\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{25}{28}\)
\(b,x+\dfrac{7}{5}=\dfrac{9}{8}.\dfrac{4}{27}\)
\(\Rightarrow x+\dfrac{7}{5}=\dfrac{1}{6}\)
\(\Rightarrow x=\dfrac{1}{6}-\dfrac{7}{5}\)
\(\Rightarrow x=-\dfrac{37}{30}\)
\(c,\dfrac{2}{5}-\dfrac{3}{7}=\dfrac{x}{70}\)
\(\Rightarrow\dfrac{-1}{35}=\dfrac{x}{70}\)
\(\Rightarrow35x=-70\)
\(\Rightarrow x=-2\)
\(d,\dfrac{2}{9}-\dfrac{7}{8}.x=1\)
\(\Rightarrow\dfrac{7}{8}x=\dfrac{2}{9}-1\)
\(\Rightarrow\dfrac{7}{8}x=-\dfrac{7}{9}\)
\(\Rightarrow x=-\dfrac{8}{9}\)
Bạn nhầm môn rồi nhé!Bạn nên nhập đúng môn để có đáp án nhanh nhất!
Bạn xem lại đề có phải sai ko nhé!
5^2x-3 thì là 5^(2x-3) phải ko? Bạn nên ghi đề rõ ràng để có đáp án đúng nhất nhé