![](https://rs.olm.vn/images/background/bg12318878441421.jpg?v=2?)
![](https://rs.olm.vn/images/avt/1.png?13)
Nguyễn Ngọc Diệp
Giới thiệu về bản thân
![](https://rs.olm.vn/images/medal_mam_non.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
![](https://rs.olm.vn/images/medal_tan_binh.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
![](https://rs.olm.vn/images/medal_chuyen_can.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
![](https://rs.olm.vn/images/medal_cao_thu.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
![](https://rs.olm.vn/images/medal_thong_thai.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
![](https://rs.olm.vn/images/medal_kien_tuong.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
![](https://rs.olm.vn/images/medal_dai_kien_tuong.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1-1/6
=5/6
217+[43+(-217)+(-23)]
=217+(43-217-23)
=217+43-217-23
=(217-217)+(43-23)
=0+20
=20
a) 5x . 52 = 540 b) 34 . 3x = 326 . 9
=> x .2 = 40 => 34 . 3x = 326 . 32
=> x = 40 : 2 => 34 . 3x = 328
=> x = 20 => 4 . x = 28
=> x = 7
c) 42x . 4 = 162
=> 42x . 4 = 44
=> 2x . 1 = 4
=> 2x = 4
=> x = 2
ko có tính chất phân phối đối với phép chia đâu Phan Minh Trang ạ
đường chéo 1:(86-22):2=32(cm)
đường chéo 2: 86-32=54(cm)
diện tích hình thoi:(32x54)x1/2=863(cm2)
tự viết lời giải nha!!!!!!!
56/10=5,6 ; 4/100=0,04
a) 1038 : 6,8=152,64
b) 53 : 49,8=1,06
Lập đc các số : 369; 396; 639; 693; 936; 963
10 - (x - 3) : 2 = 72 - 110
10 - (x - 3) : 2 = 72 -1
10 - (x - 3) : 2 = 71
(x - 3) : 2 = 10- 71
(x - 3) : 2 = -61
x - 3 =-61.2
x - 3 =-122
x =-122+3
x=-119
Vậy x=-119