5 + 5 + 5 - 15
6 - 6 - 6
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
Tính
1. 6/5 - 1/4 + 4/5 - 3/4
2. 7/9 - 5/12 + 2/9 - 7/12
3. -4/15 + 5/13 - 11/15 + 8/13
4. 9/15 - 7/13 +6/15 - 6/13
5. 12/5 - 3/7 + 3/5 - 4/7
6. 6/5 - 1/4 + 4/5 - 3/4 + 1/2
7. 13/7 - 8/6 + 8/7 - 4/6 - 1/3
Tính
1. 6/5 - 1/4 + 4/5 - 3/4
2. 7/9 - 5/12 + 2/9 - 7/12
3. -4/15 + 5/13 - 11/15 + 8/13
4. 9/15 - 7/13 +6/15 - 6/13
5. 12/5 - 3/7 + 3/5 - 4/7
6. 6/5 - 1/4 + 4/5 - 3/4 + 1/2
7. 13/7 - 8/6 + 8/7 - 4/6 - 1/3
6/5 có nghĩa là sáu phần năm đó nha mn
\(\frac{6}{5}-\frac{1}{4}+\frac{4}{5}-\frac{3}{4}\)
\(=\left(\frac{6}{5}+\frac{4}{5}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1\)
\(=1\)
\(\frac{7}{9}-\frac{5}{12}+\frac{2}{9}-\frac{7}{12}\)
\(=\left(\frac{7}{9}+\frac{2}{9}\right)-\left(\frac{5}{12}+\frac{7}{12}\right)\)
\(=1-1\)
\(=0\)
các câu sau tương tự
A=1
B=0
C=ÂM 8/15
D=0
E=2
F=3/2
H=2/3
LẦN SAU CHO KHÓ SÍU NHA LỚP 5 CŨNG LÀM ĐC
( 25^6 + 15^6 - 10^6 ) : 5^6 - ( 5^6 + 3^6 )
( 25^6 + 15^6 - 10^6 ) : 5^6 - ( 5^6 + 3^6 ) = -64
Nguyễn Thị Tuyết Sương ah , mk bt kq r thứ mik cần là lời giải cơ
15/15+5/6+1/5+4/5+1/6-3=?
\(=1+\left(\frac{1}{5}+\frac{4}{5}\right)+\left(\frac{5}{6}+\frac{1}{6}\right)\)-3
\(=\left(1+1+1\right)-3\)
= 3-3
= 0
Hãy so sánh giá trị của các biểu thức sau
A=15×6+30÷6+5
B=15×(60+30)÷6+5
C= 15×(6+30÷6+5)
(-3)^6 . 15^5 + 9^3 . (-15)^6/(-3)^10 . 5^5 . 2^3
Ta có: \(\dfrac{\left(-3\right)^6\cdot15^5+9^3\cdot\left(-15\right)^6}{\left(-3\right)^{10}\cdot5^5\cdot2^3}\)
\(=\dfrac{3^6\cdot3^5\cdot5^5+3^6\cdot3^6\cdot5^6}{3^{10}\cdot5^5\cdot2^3}\)
\(=\dfrac{3^{11}\cdot5^5+3^{11}\cdot3\cdot5^5\cdot5}{3^{10}\cdot5^5\cdot2^3}\)
\(=\dfrac{3^{11}\cdot5^5\left(1+3\cdot5\right)}{3^{10}\cdot5^5\cdot2^3}\)
\(=\dfrac{3\cdot9}{8}=\dfrac{27}{8}\)
tính bằng cách thuận tiện nhất :
5/6 x 7/5 + 5/6 : 15/3 + 5/6 x 3/5 - 5/6
\(\dfrac{5}{6}\times\dfrac{7}{5}+\dfrac{5}{6}:\dfrac{15}{3}+\dfrac{5}{6}\times\dfrac{3}{5}-\dfrac{5}{6}\\ =\dfrac{5}{6}\times\dfrac{7}{5}+\dfrac{5}{6}\times\dfrac{1}{5}+\dfrac{5}{6}\times\dfrac{3}{5}-\dfrac{5}{6}\\ =\dfrac{5}{6}\times\left(\dfrac{7}{5}+\dfrac{1}{5}+\dfrac{3}{5}-1\right)\\ =\dfrac{5}{6}\times\dfrac{6}{5}=1\)
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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