40:(3+4) x 3= ?
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)
![](https://rs.olm.vn/images/avt/0.png?1311)
Học sinh nhẩm và ghi:
8 x 5 = 40
8 x 4 = 32
8 x 6 = 48
8 x 3 = 24
40 : 8 = 5
32 : 8 = 4
48 : 8 = 6
24 : 8 = 3
40 : 5 = 8
32 : 4 = 8
48 : 6 = 8
24 : 3 = 8
(chú ý: mối quan hệ giữa nhân và chia)
Tính nhẩm:
8 x 5 = 40
8 x 4 = 32
8 x 6 = 48
8 x 3 = 24
40 : 8 = 5
32 : 8 = 4
48 : 8 = 6
24 : 8 = 3
40 : 5 = 8
32 : 4 = 8
48 : 6 = 8
24 : 3 = 8
![](https://rs.olm.vn/images/avt/0.png?1311)
2/3 = 2 x 4/ 3 x 4 =8/12
8/14 = 8 : 2/ 14 : 2 =4/7
5/9 = 5 x3/ 9 x 3 =15/37
35/ 40 = 35 : 5/ 40 : 5=7/8
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\(\frac{3}{7}+\frac{1}{7}:x=\frac{3}{14}\)
\(\frac{1}{7}:x=-\frac{3}{14}\)
\(x=\frac{1}{7}:-\frac{3}{14}\)
\(x=-\frac{2}{3}\)
Vậy \(x=-\frac{2}{3}\)
b)Đề ghi ko hiểu
c)khó hiểu quá sao bn ko ghi Fx đi
b,/2x-3/la tri tuyet doi con lai la phan so
c tri tyet doi 3/4x-3/4tri tuyet doi am 3/4= tri tuyet doi am3/4
co hieu j ko
![](https://rs.olm.vn/images/avt/0.png?1311)
20 x 4 = 80 | 200 x 3 = 600 | 2000 x 2 = 4000 |
30 x 4 = 120 | 300 x 3 = 900 | 3000 x 2 = 6000 |
40 x 4 = 160 | 400 x 3 = 1200 | 4000 x 2 = 8000 |
![](https://rs.olm.vn/images/avt/0.png?1311)
1:
\(\Leftrightarrow\left(x^2+5x+6\right)\left(x^2+5x+4\right)=24\)
\(\Leftrightarrow\left(x^2+5x\right)^2+10\left(x^2+5x\right)=0\)
\(\Leftrightarrow x^2+5x=0\)
=>x=0 hoặc x=-5
3: \(\Leftrightarrow\left(x^2+x+6\right)\left(x^2+x-2\right)=0\)
=>(x+2)(x-1)=0
=>x=-2 hoặc x=1
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left|x+\frac{3}{4}\right|-\frac{1}{3}=0\)
\(\Rightarrow\left|x+\frac{3}{4}\right|=\frac{1}{3}\)
\(\Rightarrow\left[\begin{array}{nghiempt}x+\frac{3}{4}=\frac{1}{3}\\x+\frac{3}{4}=-\frac{1}{3}\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{1}{3}-\frac{3}{4}\\x=-\frac{1}{3}-\frac{3}{4}\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=-\frac{5}{12}\\x=-\frac{13}{12}\end{array}\right.\)
Vậy \(\left[\begin{array}{nghiempt}x=-\frac{5}{12}\\x=-\frac{13}{12}\end{array}\right.\)
\(\text{|x-1,7|=2,3}\)
\(\Rightarrow\left[\begin{array}{nghiempt}x-1,7=2,3\\x-1,7=-2,3\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=2,3+1,7\\x=-2,3+1,7\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=4\\x=-0,6\end{array}\right.\)
Vậy \(\left[\begin{array}{nghiempt}x=4\\x=-0,6\end{array}\right.\)
40 : (3 + 4) x 3
= 40 : 7 x 3
= \(\frac{40}{7}x3\)
=\(\frac{120}{7}\)
=\(17\frac{1}{7}\)