4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 5 =???
1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5 1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+3+5+5+1+1+1+1+1+2+4+4+4+4+4+5+5+4+4+4+3+0+3+5+5+1+1.0+0+0+0+0+0+0+0++5+4+4+4+3+3+5+5+7= ? CHỈ CÓ NHỮNG NGƯỜI THÔNG MINH MỚI LÀM ĐC ĐÚNG TÔI TÍCH CHO MỖI NGƯỜI 1 CÁI
tự đi mà l.m nhìn ngứa cả mắt
Viết số thích hợp vào chỗ chấm:
4×6=… 4×4=…5×4=…5×8=…
2×4=…4×7=…5×6=…5×2=…
4×9=…4×8=…5×7=…5×3=…
3×4=…4×10=…5×10=…5×9=…
4 × 6 = 24 4 × 4 = 16 5 × 4 = 20 5 × 8 = 40 |
2 × 4 = 8 4 × 7 = 28 5 × 6 = 30 5 × 2 = 10 |
4 × 9 = 36 4 × 8 = 32 5 × 7 = 35 5 × 3 = 15 |
3 × 4 = 12 4 × 10 = 40 5 × 10 = 50 5 × 9 = 45 |
4 x 6 = 24 4 x 4 = 16 5 x 4 = 20 5 x 8 = 40
2 x 4 = 8 4 x 7 = 28 5 x 6 = 30 5 x 2 = 10
4 x 9 = 36 4 x 8 = 32 5 x 7 = 35 5 x 3 = 15
3 x 4 = 12 4 x 10 = 40 5 x 10 = 50 5 x 9 = 45
A=1+4+4^2+4^3+4^4+4^5+4^6+4^7+4^8+4^9+4^10+4^11 A co chia hết cho 5 hay không
A=1+4+4^2+4^3+4^4+4^5+4^6+4^7+4^8+4^9+4^10+4^11
A=(1+4)+(4^2+4^3)+(4^4+4^5)+(4^6+4^7)+(4^8+4^9)+(4^10+4^11)
A=(1+4)+4^2(1+4)+4^4(1+4)+4^6(1+4)+4^8(1+4)+4^10(1+4)
A=5(1+4^2+4^4+4^6+4^8+4^10) chia hết cho 5
Vậy A chia hết cho 5
-4/1 . 4/5 - 4/5 . 4/9 - 4/9 . 4/13 - ........- 4/2013 . 4/2017
Rút gọn biểu thức: P=[(1+4)(5^4+4)(9^4+4).......(21^4+4)] / [(3^4+4)(7^4+4)(11^4+4).......(23^4+4)]
rut go:
P=(1^4+4)(5^4+4)(9^4)...(21^4+4)/(3^4+4)(7^4+4)(11^4+4)...(23^4+4)
\(a^4+4=a^4+4a^2+4-4a^2=\left(a^2+2\right)^2-\left(2a\right)^2=\left(a^2-2a+2\right)\left(a^2+2a+2\right)\) \(=\left[\left(a-1\right)^2+1\right]\left[\left(a+1\right)^2+1\right]\)
Áp dụng công thức trên, ta có:
\(P=\frac{\left(0^2+1\right)\left(2^2+1\right)\left(4^2+1\right)\left(6^2+1\right).....\left(20^2+1\right)\left(22^2+1\right)}{\left(2^2+1\right)\left(4^2+1\right)\left(6^2+1\right)\left(8^2+1\right).....\left(22^2+1\right)\left(24^2+1\right)}=\frac{1}{24^2+1}=\frac{1}{577}\)
Chúc bạn học tốt.
\(\dfrac{1^4+4}{3^4+4}.\dfrac{5^4+4}{7^4+4}....\dfrac{17^4+4}{19^4+4}\)=M
tính m
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
3 × 4 = | 2 × 6 = | 4 × 3 = | 5 × 6 = |
3 × 7 = | 2 × 8 = | 4 × 7 = | 5 × 4 = |
3 × 5 = | 2 × 4 = | 4 × 9 = | 5 × 7 = |
3 × 8 = | 2 × 9 = | 4 × 4 = | 5 × 9 = |
3 × 4 = 12 | 2 × 6 = 12 | 4 × 3 = 12 | 5 × 6 = 30 |
3 × 7 = 21 | 2 × 8 = 16 | 4 × 7 = 28 | 5 × 4 = 20 |
3 × 5 = 15 | 2 × 4 = 8 | 4 × 9 = 36 | 5 × 7 = 35 |
3 × 8 = 24 | 2 × 9 = 18 | 4 × 4 = 16 | 5 × 9 = 45 |
cột 1 cột 2 cột 3 cột 4
12 12 12 30
21 16 28 20
15 8 36 35
24 18 16 45
theo thứ tự trên bảng nhé