GIẢI RÕ RÀNG TỪNG CÂU RA CHO MIK NHÁ CHI TIẾT VÀO
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Anh làm 1 câu thôi nhá, sắp thi anh rồi ;-;
x = 5/4 - 2/3
x = 7/12
a) \(x+\dfrac{4}{5}=\dfrac{45}{5}-\left(\dfrac{3}{7}+\dfrac{3}{5}\right)\)
\(x+\dfrac{4}{5}=\dfrac{45}{5}-\dfrac{36}{35}\)
\(x+\dfrac{4}{5}=\dfrac{279}{35}\)
\(x=\dfrac{279}{35}-\dfrac{4}{5}\)
\(x=\dfrac{251}{35}\)
b) \(\dfrac{5}{8}\times x=\dfrac{4}{5}\)
\(x=\dfrac{4}{5}\div\dfrac{5}{8}\)
\(x=\dfrac{32}{25}\)
a)
= 5/27 + 2/3
= 5/27 + 18/27
= 23/27
b)
= 28/7 - 3/7
= 257
c)
= 14/168
= 1/12
d)
= 3/7 x 1/4
= 3/28
a)
= 5/27 + 2/3
= 5/27 + 18/27
= 23/27
b)
= 28/7 - 3/7
= 257
c)
= 14/168
= 1/12
d)
= 3/7 x 1/4
= 3/28
\(a,\dfrac{7}{12}+\dfrac{3}{4}\times\dfrac{2}{9}=\dfrac{7}{12}+\dfrac{1}{6}=\dfrac{7}{12}+\dfrac{2}{12}=\dfrac{9}{12}=\dfrac{3}{4}\)
\(b,\dfrac{8}{9}-\dfrac{4}{15}:\dfrac{2}{5}=\dfrac{8}{9}-\dfrac{4}{15}\times\dfrac{5}{2}=\dfrac{8}{9}-\dfrac{2}{3}=\dfrac{8}{9}-\dfrac{6}{9}=\dfrac{2}{9}\)
a)\(\left(\dfrac{4}{6}+\dfrac{14}{6}\right)+\left(\dfrac{7}{13}+\dfrac{19}{13}\right)+\left(\dfrac{17}{9}+\dfrac{1}{9}\right)=\dfrac{18}{6}+\dfrac{26}{13}+\dfrac{18}{9}=3+2+2=7\)
b)\(\dfrac{6}{7}+\left(\dfrac{2}{1}-\dfrac{6}{7}\right)=\dfrac{6}{7}+\left(\dfrac{14}{7}-\dfrac{6}{7}\right)=\dfrac{6}{7}+\dfrac{8}{7}=\dfrac{14}{7}=2\)
c)\(\dfrac{2}{3}\times\left(\dfrac{15}{19}+\dfrac{4}{19}\right)=\dfrac{2}{3}\times\dfrac{19}{19}=\dfrac{2}{3}\times1=\dfrac{2}{3}\)
a)(46+146)+(713+1913)+(179+19)=186+2613+189=3+2+2=7(46+146)+(713+1913)+(179+19)=186+2613+189=3+2+2=7
b)67+(21−67)=67+(147−67)=67+87=147=267+(21−67)=67+(147−67)=67+87=147=2
c)