2+4+6+...+20
Những câu hỏi liên quan
6/2×4 + 6/4×6 + 6/6×8 + ...+ 6/20×20
4 5. 4. 6.
--- + --- --- + ---
15 6. 5. 7
3. 4. 2. 5
--- + --- --- + ---
5. 20. 5. 12
4 5. 4. 6.
--- + --- --- + ---
15 6. 5. 7
3. 4. 2. 5
--- + --- --- + ---
5. 20. 5. 12
4 5. 4. 6.
--- + --- --- + ---
15 6. 5. 7
3. 4. 2. 5
--- + --- --- + ---
5. 20. 5. 12
4 5. 4. 6.
--- + --- --- + ---
15 6. 5. 7
3. 4. 2. 5
--- + --- --- + ---
5. 20. 5. 12
4 5. 4. 6.
--- + --- --- + ---
15 6. 5. 7
3. 4. 2. 5
--- + --- --- + ---
5. 20. 5. 12
4 5. 4. 6.
--- + --- --- + ---
15 6. 5...
Đọc tiếp
4 5. 4. 6.
--- + --- --- + ---
15 6. 5. 7
3. 4. 2. 5
--- + --- --- + ---
5. 20. 5. 12
4 5. 4. 6.
--- + --- --- + ---
15 6. 5. 7
3. 4. 2. 5
--- + --- --- + ---
5. 20. 5. 12
4 5. 4. 6.
--- + --- --- + ---
15 6. 5. 7
3. 4. 2. 5
--- + --- --- + ---
5. 20. 5. 12
4 5. 4. 6.
--- + --- --- + ---
15 6. 5. 7
3. 4. 2. 5
--- + --- --- + ---
5. 20. 5. 12
4 5. 4. 6.
--- + --- --- + ---
15 6. 5. 7
3. 4. 2. 5
--- + --- --- + ---
5. 20. 5. 12
4 5. 4. 6.
--- + --- --- + ---
15 6. 5. 7
3. 4. 2. 5
--- + --- --- + ---
5. 20. 5. 12
4 5. 4. 6.
--- + --- --- + ---
15 6. 5. 7
3. 4. 2. 5
--- + --- --- + ---
5. 20. 5. 12
Khoanh vào phân số lớn hơn 1_3
\(M=\dfrac{4^{20}-2^{20}+6^{20}}{6^{20}-3^{20}+9^{20}}\)
M=\(\dfrac{4^{20}-2^{20}+6^{20}}{6^{20}-3^{20}+9^{20}}\)
M=\(\dfrac{\left(4-2+6\right)^{20}}{\left(6-3+9\right)^{20}}\)
M=\(\dfrac{8^{20}}{12^{20}}\)
M=\(\dfrac{8}{12}\)
M=\(\dfrac{2}{3}\)
CHÚC BẠN HỌC TỐT NHA!!!
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(4^20-2^20+6^20)/(6^20-3^20+9^20)
0.00030072865 nha
Điền > < =
a) 3 x 5 ..... 3 x 6
3 x 5 ..... 3x 4
b) 3 x 5 ..... 5 x 3
4 x 6 ..... 6 x 4
c) 20 : 4 ..... 20 : 5
20 : 4 ..... 20 : 2
a) 3 x 5 < 3 x 6
3 x 5 > 3x 4
b) 3 x 5 = 5 x 3
4 x 6 = 6 x 4
c) 20 : 4 > 20 : 5
20 : 4 < 20 : 2
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a, 3 x 5 < 3 x 6
b, 3 x 5 > 3 x 4
c,
a) 3 x 5 < 3 x 6; 3 x 5 > 3 x 4.
b) 3 x 5 = 5 x 3; 4 x 6 = 6 x 4.
c) 20 : 4 > 20 : 5; 20 : 4 < 20 : 2
Mong em làm bài được điểm 10
Xem thêm câu trả lời
\(M=\frac{\text{2 . 6 . 10 + 4 . 12 . 20 + 6 . 18 . 30 + ..... + 20 . 60 . 100}}{\text{1 . 2 . 3 + 2 . 4 . 6 + 3 . 6 . 9 + ..... + 10 . 20 . 30}}\)
Rút gọn biểu thức trên nha.
\(M=\frac{2.6.10+4.12.20+...+20.60.100}{1.2.3+2.4.6+...+10.20.30}=\frac{2.6.10.1^3+2.6.10.2^3+...+2.6.10.10^3}{1.2.3.1^3+1.2.3.2^3+...+1.2.3.10^3}\)
\(=\frac{2.6.10.\left(1^3+2^3+...+10^3\right)}{1.2.3.\left(1^3+2^3+...+10^3\right)}=\frac{2.6.10}{1.2.3}=20\)
vậy M=20
Tính nhẩm :
4 × 5 .....
5 × 4 .....
20 : 4 .....
20 : 5 .....
3 × 4 .....
4 × 3 .....
12 : 3 .....
12 : 4 .....
4 × 2 .....
2 × 4 .....
8 : 4 .....
8 : 2 .....
2 × 3 .....
3 × 2 ....
6 : 2 .....
6 : 3 .....
Đọc tiếp
Tính nhẩm :
| 4 × 5 = ..... | 5 × 4 = ..... | 20 : 4 = ..... | 20 : 5 = ..... |
| 3 × 4 = ..... | 4 × 3 = ..... | 12 : 3 = ..... | 12 : 4 = ..... |
| 4 × 2 = ..... | 2 × 4 = ..... | 8 : 4 = ..... | 8 : 2 = ..... |
| 2 × 3 = ..... | 3 × 2 = .... | 6 : 2 = ..... | 6 : 3 = ..... |
Phương pháp giải:
Nhẩm lại bảng nhân và chia trong phạm vi đã học rồi điền kết quả vào chỗ trống.
Lời giải chi tiết:
| 4 × 5=20 | 5 × 4=20 | 20 : 4=5 | 20 : 5=4 |
| 3 × 4=12 | 4 × 3=12 | 12 : 3=4 | 12 : 4=3 |
| 4 × 2=8 | 2 × 4=8 | 8 : 4=2 | 8 : 2=4 |
| 2 × 3=6 | 3 × 2=6 | 6 : 2=3 | 6 : 3=2 |
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Tính:
2 × 3=… 6 : 3=… 6 : 2=…
3 × 5=… 15 : 3=… 15 : 5=…
5 × 4=… 20 : 5=… 20 : 4=…
2 × 3 = 6 6 : 3 = 2 6 : 2 = 3 |
3 × 5 = 15 15 : 3 = 5 15 : 5 = 3 |
5 × 4 = 20 20 : 5 = 4 20 : 4 = 5 |
|
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\(\frac{4^{20}-2^{20}-6^{20}}{6^{20}-3^{20}+9^{20}}\)
\(\frac{4^{20}-2^{20}-6^{20}}{6^{20}-3^{20}-9^{20}}=\frac{2^{20}.2^{20}-2^{20}-2^{20}.3^{20}}{3^{20}.2^{20}-3^{20}-3^{20}.3^{20}}\)
\(=\frac{2^{20}\left(2^{20}-1-3^{20}\right)}{3^{20}\left(2^{20}-1-3^{20}\right)}=\frac{2^{20}}{3^{20}}\)
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\(\frac{4^{20}-2^{20}+6^{20}}{6^{20}-3^{20}+9^{20}}\)
\(\frac{4^{20}-2^{20}+6^{20}}{6^{20}-3^{20}+9^{20}}\)=\(\frac{2^{40}-2^{20}+2^{20}.3^{20}}{3^{20}.2^{20}-3^{20}+3^{40}}\)=\(\frac{2^{20}.\left(2^{20}-1+3^{20}\right)}{3^{20}.\left(2^{20}-1+3^{20}\right)}\)=\(\frac{2^{20}}{3^{20}}\)
Nhớ k nhá
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