2+4 bằng bao nhiêu ạ
K
Khách
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16 tháng 3 2022
Ta có: \(\dfrac{4}{15}\) + \(\dfrac{2}{13}\) = \(\dfrac{52+30}{195}\) = \(\dfrac{82}{195}\)
NN
0
LT
3
F
9 tháng 10 2020
\(S=1+2+...+100\)
\(=\left(1+100\right)+\left(2+99\right)+...+\left(50+51\right)\)
\(=101+101+...+101\)
Số các số hạng là:(100-1):1+1=100
=>Có 50 cặp có tổng là 101
Ta có:101.50=5050
9 tháng 10 2020
Số số hạng : (100-2):1+ 1=99 (số)
Tổng = (100+2)x99:2 = 5049
Bài này áp dụng công thức tính số số hạng và tổng, không vận dụng nâng cao gì cả nhé
NK
3
NT
2
25 tháng 9 2018
Ví dụ:x=22;22:5=4(dư 2)
Nên:22:4=5(dư 2)
ĐÁP SỐ:22
HOK TỐT
25 tháng 9 2018
x=3
Vì x:5 dư 2 mà chữ số tận cùng : hết cho 5 là 0 và 5,x;5 dư 2 nên ta loại chữ số 5.
số chia hết cho 5 là :
2*5+2=12
Vậy x:4=3 hoặc x là 22,32,42,.....
NT
2
LT
2
2+4=6
tk cho m
HT
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