Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
1) Ta có: \(\left(\dfrac{3}{4}\cdot\dfrac{5}{97}+\dfrac{1}{9}\cdot\dfrac{13}{47}\right)\cdot\left(\dfrac{1}{5}-\dfrac{7}{25}\cdot\dfrac{5}{7}\right)\)
\(=\left(\dfrac{3}{4}\cdot\dfrac{5}{97}+\dfrac{1}{9}\cdot\dfrac{13}{47}\right)\cdot\left(\dfrac{1}{5}-\dfrac{1}{5}\right)\)
=0
2) Ta có: \(\dfrac{8}{17}\cdot\dfrac{4}{15}+\dfrac{8}{17}\cdot\dfrac{22}{15}-\dfrac{8}{15}\cdot\dfrac{9}{17}\)
\(=\dfrac{8}{17}\left(\dfrac{4}{15}+\dfrac{22}{15}-\dfrac{9}{15}\right)\)
\(=\dfrac{8}{17}\cdot\dfrac{15}{15}=\dfrac{8}{17}\)
3) Ta có: \(\dfrac{2021}{2}\cdot\dfrac{1}{3}+\dfrac{4042}{4}\cdot\dfrac{1}{5}+\dfrac{6063}{3}\cdot\dfrac{22}{15}\)
\(=\dfrac{2021}{2}\left(\dfrac{1}{3}+\dfrac{1}{5}\right)+2021\cdot\dfrac{22}{15}\)
\(=\dfrac{2021}{2}\cdot\dfrac{8}{15}+\dfrac{2021}{2}\cdot\dfrac{44}{15}\)
\(=\dfrac{2021}{2}\cdot\dfrac{52}{15}\)
\(=\dfrac{52546}{15}\)
4) Ta có: \(\dfrac{4}{7}\cdot\dfrac{2}{13}+\dfrac{8}{13}:\dfrac{7}{4}+\dfrac{4}{7}:\dfrac{13}{2}+\dfrac{4}{7}\cdot\dfrac{1}{13}\)
\(=\dfrac{4}{7}\left(\dfrac{2}{13}+\dfrac{8}{13}+\dfrac{2}{13}+\dfrac{1}{13}\right)\)
\(=\dfrac{4}{7}\)
1/3 + 1/4 + 1/5 + 12/15 + 22/33 + 16/64
=(1/3 + 22/33 ) + (1/4 + 16/64) + (1/5 + 12/15 )
= 1 + 1/2 + 1
= 5/2
Nhớ k cho mình nha!
a, 21/11-9/19-3/13-12/38-24/22 =21/11-(9/19-3/13)-12/38-24/22 =207/143-12/38-24/22 =3075/2717-24/22 =111/2717 b,2/3+3/4+4/5+12/9+28/16+48/15 =17/12+4/5+12/9+28/16+48/15 =133/60+12/9+28/16+48/15 =71/20+28/16+48/15 =53/10+48/15 =17/2 c, 4/5-1/2-1/4-1/8-1/16-1/36 =3/10-1/4-1/8-1/36 =1/20-1/8-1/16-1/36 =-3/40-1/16-1/36 =-11/60-1/36=-119/720
1/3+1/4+1/5+/12/15+22/33+48/64
=1/3+1/4+1/5+4/5+2/3+3/4
=3
dung 100% luon
Ai k cho minh 3 k thi minh se k cho nguoi ay 5 k
a) 1/3 + 3/4 - 7/12
= 4/12 + 9/12 - 7/12
= 6/12
= 1/2
b) 6/11 : 5/22 - 4/5
= 6/11 * 22/5 - 4/5
= 12/5 - 4/5
= 8/5
c) 5/18 * 8
= 40/18
= 20/9
d) 7/15 : 5
= 7/15 * 1/5
= 7/75
OK
a, \(\frac{1}{3}+\frac{3}{4}-\frac{7}{12}\)
= \(\frac{13}{12}-\frac{7}{12}\)
= \(\frac{1}{2}\)
\(b,\frac{6}{11}:\frac{5}{22}-\frac{4}{5}\)
= \(\frac{12}{5}-\frac{4}{5}\)
\(=\frac{8}{5}\)
\(c,\frac{5}{18}x8\)
=\(\frac{20}{9}\)
\(d,\frac{7}{15}:5\)
= \(\frac{7}{15}x\)\(\frac{1}{5}\)
\(=\frac{7}{75}\)
rút gọn:
- chia cả tử và mẫu phân số 22/33 cho 11 được 2/3.
- chia cả tử và mẫu phân số 16/64 cho 16 được 1/4.
- chia cả tử và mẫu phân số 12/15 cho 3 được 4/5.
Biểu thức thu được là:
1/3 + 1/4 +1/5 + 4/5 + 2/3 + 1/4 = ( 1/3 + 2/3 ) + (1/4 + 1/4) + (1/5 + 4/5) = 1 + 1/2 + 1 = 5/2
Đáp án: 5/2
1/3 + 1/4 + 1/5 + 1/5 + 2/3 + 1/4
= ( 1/4 + 1/4 ) 1/3 + 2/3 ) + ( 1/5 + 4/5 )
= 2/4 + 3/3 + 5/5
= 2 + 1+ 1
= 4
Bài này mình làm rồi
\(\frac{15}{22}\div\frac{y}{8}=\frac{4}{33}\)
\(\frac{y}{8}=\frac{15}{22}\div\frac{4}{33}\)
\(y=\frac{495}{88}\)
(not có chắc nha ;-;)
\(\frac{15}{22}\div\frac{y}{8}=\frac{4}{33}\)
\(\Leftrightarrow\frac{y}{8}=\frac{15}{22}\div\frac{4}{33}\)
\(\Leftrightarrow\frac{y}{8}=\frac{45}{8}\)
\(\Leftrightarrow y=45\)
Vậy y=45
Chúc bạn học tốt !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
= 103/60
\(\dfrac{22}{15}+\dfrac{1}{4}=\dfrac{88}{60}+\dfrac{15}{60}=\dfrac{103}{60}\)