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Độ dài đáy của hình tam giác đó là :

     2 x 123 : 12 = 20,5 ( cm )

                   Đáp số : 20,5 cm

3 tháng 2 2018

đảo ngược công thức tính dt roi thay số vao là xong

24 tháng 2 2022

Diện tích đáy là:
128 : 2 = 64 (cm2)
Vì 64 = 8 x 8
Nên cạnh hình lập phương là 8 cm :
Thể tích hình lập phương là :
8 x 8 x 8 = 512 (cm3)

T cho mik nha 

Chúc bạn học tốt !!! :))

24 tháng 2 2022

mình thực sự cảm mơn bạn rất nhiều 

3 tháng 6 2021

bằng 105 nha. gọi s là kí hiệu diện tích ta có ":

Sabg=1/4 Sabc

Schb=1/2 Sabc

=> Schb- Shqgb=S qgc

S abg- S hqgb= S ahq

Từ 2 điều trên t thấy :

S qgc = 2Sahq

ta lại thấy:

S ahq= 1/3 Sqgc

ta coi S qgc là 2p thì S ahq và S bhq là 1p và S bqg lad 2/3 phần.

S abg =1/4 S abc= 1120:4= 280

Sbhq= 280:( 1+1+2/3)= 105

                                                   Đ/s:...................

Nhớ k nha Phanh, để t bảo cô An m tra mạng

3 tháng 6 2021

tuệ ơi hello mách cô mau mau

điền số thích hợp vào chỗ chấm:a.1kg275g=.........kg                                                  3kg 45g=...............kg   7 tấn 125kg=.........tấn                                            2 tấn 64kg=............tấn   1 tấn 3 tạ=.............tấn                                            4 tạ=............tấn   12kg 5g=...........kg                                                  177kg=.........tấn    64g=.............kg                                ...
Đọc tiếp

điền số thích hợp vào chỗ chấm:

a.1kg275g=.........kg                                                  3kg 45g=...............kg

   7 tấn 125kg=.........tấn                                            2 tấn 64kg=............tấn

   1 tấn 3 tạ=.............tấn                                            4 tạ=............tấn

   12kg 5g=...........kg                                                  177kg=.........tấn

    64g=.............kg                                                       4 yến=.........tấn

b.8,56 dm2 (vuông)=.........cm2                                  0,42m2=........dm2

1,8ha=.........m2                                                           0,001ha=.........m2

6,9m2=...........m2........dm2                                       2,7dm2=...........dm2...........cm

2,5km2=.............. m2                                                 80dm2=..........m2

0,03ha=..............m2 

1
5 tháng 11 2017

 a.1kg275g=1,275kg                                          3kg 45g=3,045kg

   7 tấn 125kg=7,125tấn                                     2 tấn 64kg=2,064tấn

   1 tấn 3 tạ=1,3tấn                                            4 tạ=0,4tấn

   12kg 5g=12,005kg                                         177kg=0,177tấn

    64g=0,064kg                                             4 yến=.........tấn

b.8,56 dm2 (vuông)=.856cm2                                  0,42m2=42dm2

1,8ha=18000000m2                                                0,001ha=10m2

6,9m2=6m2 0,9dm2                                                2,7dm2=2dm2 0,7cm2

2,5km2=250000m2                                                  80dm2=0,8m2

0,03ha=300m2 

9 tháng 4 2021

vế 1 là đó là mùa của những cánh diều no gió, vế 2 là đoạn còn lại

vế 1 : chủ ngữ : đó , vị ngữ là mùa của những cánh diều no gió

vế 2 : chủ ngữ: mùa, vị ngữ là của những tâm hồn khát vọng tuổi thơ.

kết bạn với mình nha !!!!!!!!!!!!!!!!!

7 tháng 4 2021

vế 1 chủ ngữ là mùa, vị ngữ là những cánh diều no gió, còn vế 2 mình kob

20 tháng 3 2020

cho đi

25 tháng 10 2020

Câu 1: Mỗi buổi sáng, em thường dậy sớm để đi bộ tập thể dục.

"đi" có nghĩa là tự di chuyển bằng bàn chân

Câu 2: Em thường đi giày ba ta mỗi khi ngày đó ó tiết thể dục.

"đi" có nghĩa là mang (xỏ) vào chân hoặc tay để che, giữ

Câu 3: Sau khi chồng cô Lan bị tai nạn, cô ấy quyết định đi bước nữa.

"đi" có nghĩa là kết hôn lần nữa, sau khi chồng hoặc vợ chết.

25 tháng 10 2020

Ta có: \(\left(x+5\right)+\left(x+10\right)+...+\left(x+100\right)=1150\)

\(\Leftrightarrow20x+\left(5+10+...+100\right)=1150\)

\(\Leftrightarrow20x+\frac{\left(100+5\right)\cdot\left[\frac{\left(100-5\right)}{5}+1\right]}{2}=1150\)

\(\Leftrightarrow20x+1050=1150\)

\(\Leftrightarrow20x=100\)

\(\Rightarrow x=5\)

25 tháng 10 2020

xét : dãy số trên có 2 số hạng liền nhau hơn kém nhau 5 đơn vị 

dãy số trên có số số hạng là : 

( 100-5 ) : 5 + 1 = 20 ( số hạng )

vậy  ( x+5 ) + ( x+10) + (x+15 ) + ...+ ( x+100)= 1150

    = ( x+x+x+..+x) + ( 5+10+..+100 ) = 1150 

         x*20 + ( 100+5) * 20 : 2 = 1150

   x*20 + 1050 = 1150 

   x*20 = 1150-1050

  x*20 = 100

x=100:20

x=5