bài 1:

\(\frac{7}{4}\left(\frac{33}{42}+\frac{3333}{2020}+\frac{333333}{303030}+\frac{33333333}{42424242}\right)\)

\(=\frac{7}{4}\left(\frac{33}{12}+\frac{33}{20}+\frac{33}{30}+\frac{33}{42}\right)\)

\(=\frac{7}{4}.33\left(\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}\right)\)

\(=\frac{231}{4}\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}\right)\)

\(=\frac{231}{4}\left(\frac{1}{3}-\frac{1}{7}\right)\)

\(=\frac{231}{4}\cdot\frac{4}{21}=11\)

\(\left[\left(\frac{2}{193}-\frac{3}{386}\right).\frac{193}{17}+\frac{33}{34}\right]:\left[\left(\frac{7}{1931}+\frac{11}{3862}\right).\frac{1931}{25}+\frac{9}{2}\right]\)

= \(\left[\frac{193}{17}.\frac{2}{193}-\frac{193}{17}.\frac{3}{386}+\frac{33}{34}\right]:\left[\frac{1931}{25}.\frac{7}{1931}+\frac{1931}{25}.\frac{11}{3862}+\frac{9}{2}\right]\)

= \(\left[\frac{2}{17}-\frac{3}{17}+\frac{33}{34}\right]:\left[\frac{7}{25}+\frac{11}{50}+\frac{9}{2}\right]\)

= \(\left[\frac{4}{34}-\frac{6}{34}+\frac{33}{34}\right]:\left[\frac{14}{50}+\frac{11}{50}+\frac{225}{50}\right]\)

= \(\frac{31}{34}:2\)

= \(\frac{31}{68}\)

đề đúng

\(\frac{7}{4}\cdot\left(\frac{33}{42}+\frac{3333}{2020}+\frac{333333}{303030}+\frac{33333333}{42424242}\right)\)

Câu 2:

a: x-158=32

=>x=158+32

=>x=190

b: \(x\cdot24=264\)

=>\(x=\dfrac{264}{24}\)

=>x=11

c: \(6x+9=3^7:3^4\)

=>\(6x+9=3^3\)

=>6x+9=27

=>6x=18

=>x=18/6=3

Câu 1:

a: \(86\cdot19+14\cdot19\)

\(=19\left(86+14\right)\)

\(=19\cdot100=1900\)

b: \(4\cdot\left(-5\right)^2-104\cdot\left(-5\right)^2\)

\(=4\cdot25-104\cdot25\)

\(=25\left(4-104\right)=-100\cdot25=-2500\)

c: \(7\cdot\left(-2\right)\cdot8\left(-5\right)\)

\(=7\cdot2\cdot8\cdot5\)

\(=56\cdot10=560\)

d: \(59-\left[59+\left(-76\right)\right]\)

\(=59-59+76\)

=76

tick di rùi đây giải cho

a)  -2112

b) -2432

c)  1007

d)  944

e) 72

f)  -1871

phai ghi cach lam dung ghi dap an ko

a) 9/22 x 33/18 =3/4

b) 12/35 : 36/25 = 5/21

c) 19/17 : 76/51 =3/4

a) \(\frac{9}{22}\times\frac{33}{18}\)

\(=\frac{9}{22}\times\frac{11}{6}\)

\(=\frac{9\times11}{22\times6}=\frac{3}{4}\)

b) \(\frac{12}{35}:\frac{36}{25}=\frac{12}{35}\times\frac{25}{36}\)

                     \(=\frac{5}{21}\)

c) \(\frac{19}{17}:\frac{76}{51}=\frac{19}{17}\times\frac{51}{76}\)

                      \(=\frac{3}{4}\)

\(a,\frac{9}{22}x\frac{33}{18}\)

\(=\frac{3.3.11.3}{11.2.3.3.2}\)

\(=\frac{3}{2.2}\)

\(=\frac{3}{4}\)

\(b,\frac{12}{35}:\frac{36}{25}\)

\(=\frac{12}{35}.\frac{25}{36}\)

\(=\frac{12.25}{35.36}\)

\(=\frac{12.5.5}{5.7.12.3}\)

\(=\frac{5}{7.3}\)

\(=\frac{5}{21}\)

\(c,\frac{19}{17}:\frac{76}{51}\)

\(=\frac{19}{17}.\frac{51}{76}\)

\(=\frac{19.51}{17.76}\)

\(=\frac{19.17.3}{17.19.4}\)

\(=\frac{3}{4}\)

Có cần ghi lời giải luôn ko bạn.

cần...........thanks bạn trước nhé

tớ không biết nhưng bạn có thẻ bấm dúng cho tớ không vì chúng ta la bạn bè mà

a) (-54).76 + 12.(-76) - 76.(-34)

= (-54).76 + (-12).76 - 76.(-34)

= 76. [(-54) + (-12) - (-34)]

= 76.    (-32)

= -2432

1) \(=\frac{7}{4}.\left[\frac{2}{3}-\left(\frac{1}{2}-\frac{3}{8}\right)\right]=\frac{7}{4}.\left(\frac{2}{3}-\frac{1}{8}\right)=\frac{7}{4}.\frac{13}{24}=\frac{91}{96}\)

2) \(=\frac{3}{4}-\left[-\left(-\frac{5}{3}\right)-\left(\frac{1}{12}+\frac{2}{9}\right)\right]=\frac{3}{4}-\frac{5}{3}-\frac{-5}{36}=\frac{-11}{12}+\frac{5}{36}=\frac{-28}{36}\)

3) \(=-\frac{6}{11}+\frac{12}{-7}+\frac{-34}{77}=-\frac{42}{77}+\frac{-132}{77}+\frac{-34}{77}=\frac{-208}{77}\)

4) \(=\frac{1}{11}+\frac{2}{3}+\frac{-19}{33}=\frac{3}{33}+\frac{22}{33}+\frac{-19}{33}=\frac{6}{33}=\frac{3}{11}\)
 

Câu 2) Đinh Tuân việt nhầm:

Quy đồng \(\frac{1}{12}+\frac{2}{9}=\frac{3}{36}+\frac{8}{36}=\frac{11}{36}\)

=> Người chọn đáp án nên thấy hiểu và hợp lý  mới chọn

a: \(\dfrac{5}{3}\cdot\dfrac{7}{10}=\dfrac{5}{10}\cdot\dfrac{7}{3}=\dfrac{14}{3}>2\)

\(\dfrac{5}{7}:\dfrac{7}{10}=\dfrac{5}{7}\cdot\dfrac{10}{7}=\dfrac{50}{49}< 2\)

=>\(\dfrac{5}{3}\cdot\dfrac{7}{10}>\dfrac{5}{7}:\dfrac{7}{10}\)

b: \(\dfrac{4}{5}\cdot\dfrac{5}{6}=\dfrac{4}{6}=\dfrac{2}{3}\)

\(\dfrac{8}{9}:\dfrac{4}{3}=\dfrac{8}{9}\cdot\dfrac{3}{4}=\dfrac{8}{4}\cdot\dfrac{3}{9}=\dfrac{2}{3}\)

Do đó: \(\dfrac{4}{5}\cdot\dfrac{5}{6}=\dfrac{8}{9}:\dfrac{4}{3}\)

c: \(\dfrac{5}{11}\cdot\dfrac{33}{15}=\dfrac{5}{15}\cdot\dfrac{33}{11}=\dfrac{3}{3}=1\)

\(\dfrac{6}{17}\cdot\dfrac{34}{25}=\dfrac{34}{17}\cdot\dfrac{6}{25}=2\cdot\dfrac{6}{25}=\dfrac{12}{25}< 1\)

=>\(\dfrac{5}{11}\cdot\dfrac{33}{15}>\dfrac{6}{17}\cdot\dfrac{34}{25}\)

d: \(\dfrac{15}{19}\cdot\dfrac{38}{5}=\dfrac{15}{5}\cdot\dfrac{38}{19}=3\cdot2=6\)

\(\dfrac{15}{16}:\dfrac{3}{8}=\dfrac{15}{16}\cdot\dfrac{8}{3}=\dfrac{15}{3}\cdot\dfrac{8}{16}=\dfrac{5}{2}\)<6

=>\(\dfrac{15}{19}\cdot\dfrac{38}{5}>\dfrac{15}{16}:\dfrac{3}{8}\)

a) -2112

b) 1542

c) 1007

944

tính nhanh mà bn kết quả thì mk bít rùi mk cần cách làm cơ

dễ ẹc

cách làm :

-cầm máy tính

-nhập giữ liệu cần tính 

-nhấn dấu =

chỉ trong ba bupc71 để làm xong bài toán wa dễ