= 0,25 : 0,5 - 3/4

= 1/4 : 1/2 - 3/4

= 1/2 - 3/4

= -1/4

`0,25 :(10,3 - 9,8) - 3/4`

`= 0,25 : 0,5 - 0,75`

`= 0,5 - 0,75`

`= -0,25`

0,25 : ( 10,3 - 9,8 ) - 3/4

= 0,25 : 0,5 - 3/4

= 0,5 - 3/4

= -0,25

\(-\frac{1}{4}\)

=0,25:0,5-3/4

=0.5-3/4

=(-0,25)

li-ke cho mình nha

a) ( \(\frac{3}{8}\)+\(\frac{-1}{4}\)+\(\frac{5}{12}\)): \(\frac{2}{3}\)

=(\(\frac{9}{24}\)+\(\frac{-6}{24}\)+\(\frac{10}{24}\)):\(\frac{2}{3}\)

=\(\frac{13}{24}\):\(\frac{2}{3}\)

=\(\frac{13}{16}\)

Câu b) bn tự làm nha , mik đg có việc bận r ....Chúc bn làm tốt

Thế mà không làm được

c) x=-2 nha

d) =\(\frac{1}{5.6}\)+\(\frac{1}{6.7}\)+......+\(\frac{1}{11.12}\)

=\(\frac{1}{5}\)-\(\frac{1}{6}\)+\(\frac{1}{6}\)-\(\frac{1}{7}\)+.....+\(\frac{1}{11}\)-\(\frac{1}{12}\)

=\(\frac{1}{5}\)-\(\frac{1}{12}\)= \(\frac{7}{60}\)

bạn ơi kết quả là 7/60

\(=\frac{1}{5.6}+\frac{1}{6.7}+...+\frac{1}{11.12}\)

\(=\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+...+\frac{1}{11}-\frac{1}{12}\)

\(=\frac{1}{5}-\frac{1}{12}\)

\(=\frac{7}{60}\)

\(0,25:\left(10,3-9,8\right)-\frac{3}{4}\)

= 0,25:0,5-\(\frac{3}{4}\)

= 0,5-\(\frac{3}{4}\)

= \(\frac{1}{2}-\frac{3}{4}\)

= \(\frac{2-3}{4}\)

= \(\frac{-1}{4}\)

a) \(\left(\frac{7}{8}-\frac{3}{4}\right)\cdot\frac{1}{3}-\frac{2}{7}\cdot\left(3,5\right)=\left(\frac{7}{8}-\frac{3}{4}\right)\cdot\frac{1}{3}-\frac{2}{7}\cdot\frac{7}{2}\)

\(=\left(\frac{7}{8}-\frac{6}{8}\right)\cdot\frac{1}{3}-1=\frac{1}{8}\cdot\frac{1}{3}-1=\frac{1}{24}-\frac{24}{24}=-\frac{23}{24}\)

b) \(\left(\frac{3}{5}+0,415-\frac{3}{200}\right)\cdot2\frac{2}{3}\cdot0,25\)

\(=\left(\frac{3}{5}+\frac{83}{200}-\frac{3}{200}\right)\cdot\frac{8}{3}\cdot\frac{1}{4}\)

\(=\left(\frac{3}{5}+\frac{80}{200}\right)\cdot\frac{8}{3}\cdot\frac{1}{4}=\left(\frac{3}{5}+\frac{2}{5}\right)\cdot\frac{8}{3}\cdot\frac{1}{4}=1\cdot\frac{8}{3}\cdot\frac{1}{4}=1\cdot\frac{2}{3}\cdot\frac{1}{1}=\frac{2}{3}\)

c) \(\frac{5}{16}:0,125-\left(2\frac{1}{4}-0,6\right)\cdot\frac{10}{11}\)

\(=\frac{5}{16}:\frac{1}{8}-\left(\frac{9}{4}-\frac{3}{5}\right)\cdot\frac{10}{11}\)

\(=\frac{5}{16}\cdot8-\frac{33}{20}\cdot\frac{10}{11}=\frac{5}{2}-\frac{3}{2}=1\)

d) \(0,25:\left(10,3-9,8\right)-\frac{3}{4}=\frac{1}{4}:\left(\frac{103}{10}-\frac{98}{10}\right)-\frac{3}{4}\)

\(=\frac{1}{4}:\frac{1}{2}-\frac{3}{4}=\frac{1}{4}\cdot2-\frac{3}{4}=\frac{2}{4}-\frac{3}{4}=-\frac{1}{4}\)

Câu cuối tương tự

1) \(\left(\frac{7}{8}-\frac{3}{4}\right).1\frac{1}{3}-\frac{2}{7}.\left(3,5\right)^2\)

= \(\frac{1}{8}.\frac{4}{3}-\frac{2}{7}.\frac{49}{4}\) = \(\frac{-10}{3}\)

2) \(\frac{5}{4}:\frac{1}{2}-\frac{3}{4}\) = \(\frac{7}{4}\)

\(a,\frac{5}{16}:0,125-\left(2\frac{1}{4}-0,6\right)\cdot\frac{10}{11}\)

\(=\frac{5}{16}:\frac{1}{8}-\left(\frac{9}{4}-\frac{3}{5}\right)\cdot\frac{10}{11}\)

\(=\frac{5}{2}-\frac{33}{20}\cdot\frac{10}{11}\)

\(=\frac{5}{2}-\frac{3}{2}\)

\(=1\)

\(\frac{5}{16}:0,125-\left(2\frac{1}{4}-0,6\right).\frac{10}{11}\)

\(\Rightarrow\frac{5}{16}:\frac{125}{1000}-\left(\frac{9}{4}-\frac{6}{10}\right).\frac{10}{11}\)

\(\Rightarrow\frac{5}{16}:\frac{1}{8}-\left(\frac{9}{4}-\frac{3}{5}\right).\frac{10}{11}\)

\(\Rightarrow\frac{5}{16}.\frac{8}{1}-\left(\frac{45}{20}-\frac{12}{20}\right).\frac{10}{11}\)

\(\Rightarrow\frac{5}{2}-\frac{33}{20}.\frac{10}{11}\)

\(\Rightarrow\frac{5}{2}-\frac{3.1}{2.1}\)

\(\Rightarrow\frac{5}{2}-\frac{3}{2}=\frac{2}{2}=1\)

\(A=\frac{1}{4}:\left(10,3-9,8\right)-\frac{3}{4}\)

\(A=\frac{1}{4}:\left(0,5\right)-\frac{3}{4}\)

\(A=\frac{1}{4}:\frac{1}{2}-\frac{3}{4}\)

\(A=\frac{1}{4}\cdot2-\frac{3}{4}=\frac{1}{2}-\frac{3}{4}=\frac{2}{4}-\frac{3}{4}=\frac{-1}{4}\)

Bài 1:

a, \(A=\frac{1}{4}:0,5-\frac{3}{4}\)

       \(=\frac{1}{2}-\frac{3}{4}\)

         \(=\frac{-1}{4}\)

b, \(B=\frac{6}{7}+\frac{5}{8}:5-\frac{3}{16}.\left(-2\right)^2\)

       \(=\frac{6}{7}+\frac{1}{8}-\frac{3}{4}\)

       \(=\frac{6}{7}+\frac{-5}{8}\)

       \(=\frac{13}{56}\)

Hk tốt

\(B=\frac{6}{7}+\frac{5}{8}:5-\frac{3}{16}.\left(-2\right)^2\)

\(B=\frac{6}{7}+\frac{5}{8}\cdot\frac{1}{5}-\frac{3}{16}.4\)

\(B=\frac{6}{7}+\frac{1}{8}-\frac{3}{4}=\frac{55}{56}-\frac{3}{4}=\frac{13}{56}\)