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a)\(x+\frac{15}{16}+\frac{7}{8}=\frac{15}{4}\)
\(x+\frac{29}{16}=\frac{15}{4}\)
\(x=\frac{15}{4}-\frac{29}{16}\)
\(x=\frac{31}{16}\)
b)\(x-\frac{27}{28}-\frac{9}{14}=\frac{13}{7}\)
\(x-\frac{45}{28}=\frac{13}{7}\)
\(x=\frac{13}{7}+\frac{45}{28}\)
\(x=\frac{97}{28}\)
c)\(x\times\frac{1}{5}+x+\frac{1}{6}=\frac{2}{3}\)
\(x\times\frac{1}{5}+x=\frac{2}{3}-\frac{1}{6}\)
\(x\times\left(\frac{1}{5}+1\right)=\frac{1}{2}\)
\(x\times\frac{6}{5}=\frac{1}{2}\)
\(x=\frac{1}{2}:\frac{6}{5}\)
\(x=\frac{5}{12}\)
d)\(x:14=\frac{1}{4}+\frac{2}{9}+\frac{3}{4}\)
\(x:14=\frac{11}{9}\)
\(x=\frac{11}{9}\times14\)
\(x=\frac{154}{9}\)
#H
Bài 1
1/2 x 3/4 : 4/5
= 3/8 : 4/5
= 3/8 x 5/4
= 15/32
2/3 + 1/6 - 1/2
= 4/6 + 1/6 - 3/6
= 5/6 - 3/6
= 1/3
3/5 + 4 : 2/3 - 3/2
= 3/5 + 4 x 3/2 - 3/2
= 3/5 + 6 - 3/2
= 3/5 + 30/5 - 3/2
= 33/5 - 3/2
= 66/10 - 15/10
= 28/5
Bài 2
x - 1/4 = 1/2
x = 1/2 + 1/4
x = 2/4 + 1/4
x = 3/4
2/3 + x = 1
x = 1 - 2/3
x = 3/3 - 2/3
x = 1/3
5/7 nhân x =2/3-2/5
5/7 nhân x =10/15-6/15
5/7 nhân x =4/15
x=4/15:5/7
x=4/15x7/5
x=28/75
8/5 nhân x = 19/42 x = 19/42 : 8/5 x = 95/336 4/5 nhân x = 11/5 x = 11/5 : 4/5 x = 11/4
x= \(\frac{5}{3}-\frac{3}{7}=\frac{26}{21}\)
x=\(\frac{3}{10}+\frac{4}{5}=\frac{11}{10}\)
x=\(\frac{4}{3}-\frac{4}{5}=\frac{8}{15}\)
x=\(\frac{7}{8}:\frac{5}{6}=\frac{7}{8}x\frac{6}{5}=\frac{42}{40}=\frac{21}{10}\)
x=\(\frac{3}{2}x\frac{9}{7}=\frac{27}{14}\)
x=\(\frac{14}{15}:\frac{3}{4}=\frac{14}{15}x\frac{4}{3}=\frac{56}{45}\)
Chúc bạn học tốt!
rac roi qua
2/9 . x = 6/15 : 4/5
2/9 . x = 6/15 . 5/4
2/9 . x = 1/2
x = 1/2 : 2/9
x = 1/2 . 9/2
x = 9/4