![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a/\(\left(\dfrac{7}{9}\times\dfrac{9}{7}\right)\times\dfrac{25}{28}\)
\(=1\times\dfrac{25}{28}\)
\(=\dfrac{25}{28}\)
b/\(\dfrac{4}{7}\times\dfrac{17}{18}\times\dfrac{7}{4}\times\dfrac{18}{17}\)
\(=\left(\dfrac{4}{7}\times\dfrac{7}{4}\right)\times\left(\dfrac{17}{18}\times\dfrac{18}{17}\right)\)
\(=1\times1\)
\(=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
18*(5773+2457)+5310*6
=18 *8230+53108*6
=18*(8230+53108)*6
=18*61238*6
=11102184*6
=6613104
k cho mình nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 83 x 10 = 830
b) 710 x 100 = 71 000
c) 6 200 x 1 000 = 6 200 000
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(128+x\times24=4400\)
\(x\times24=4400-128\)
\(x\times24=4272\)
\(x=4272:24\)
\(x=178\)
b) \(125\times\left(x-18\right)=8875\)
\(x-18=8875:125\)
\(x-18=71\)
\(x=71+18\)
\(x=89\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a. \(\dfrac{x}{5}=\dfrac{8}{10}\)
\(\Rightarrow10x=8.5\)
\(\Rightarrow10x=40\)
\(\Rightarrow x=\dfrac{40}{10}=4\)
b. \(\dfrac{9}{x}=\dfrac{90}{100}\)
\(\Rightarrow9.100=90x\)
\(\Rightarrow900=90x\)
\(\Rightarrow x=\dfrac{900}{90}=10\)
c. \(17+\dfrac{x}{35}=\dfrac{5}{7}\)
\(\Rightarrow\dfrac{595+x}{35}=\dfrac{25}{35}\)
\(\Rightarrow595+x=25\)
\(\Rightarrow x=25-595=-570\)
d. \(x:\dfrac{5}{27}=\dfrac{2}{9}\)
\(\Rightarrow\dfrac{27x:5}{27}=\dfrac{6}{27}\)
\(\Rightarrow27x:5=6\)
\(\Rightarrow27x=5.6\)
\(\Rightarrow27x=30\)
\(\Rightarrow x=\dfrac{30}{27}=\dfrac{10}{9}\approx1,11\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 113 x 10 = 1 130
810 : 10 = 81
b) 234 x 100 = 23 400
7 000 : 100 = 70
c) 3 570 x 1 000 = 3 570 000
650 000 : 1 000 = 650
![](https://rs.olm.vn/images/avt/0.png?1311)
180 : ( 18 x 5 )
= 180 : 90
= 2
b) 240 : ( 2 x 3 x 4 )
= 240 : 24
= 10
c) 4400 : ( 22 x 35 )
= 4400 : 770
= \(\dfrac{40}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 32684 + 41325 + 316 + 675
= (32684 + 316) + (41325 + 675)
= 33 000 + 42 000
= 75 000
b, 25 \(\times\) 18 \(\times\) 4 \(\times\) 2
= (25 \(\times\) 4) \(\times\) (18 \(\times\) 2)
= 100 \(\times\) 36
= 3600
![](https://rs.olm.vn/images/avt/0.png?1311)
a, x = 5130 : ( 274 - 256)
x = 5130 : 18
x =285
b. x = 43434 : 18 : 19
x = 2413 : 19
x = 127
dễ mà
x*274-256*x=5130
x=5130:(274-256)
x=285
còn pt thứ 2 là lấy tích chia 2 thừa số nha
chúc bạn học tốt :)
a, = 180
a, = 1800
c, = 18000
a = 180
b=1800
c=18000
k mk nha !!!!!!