2/5x2+4x2/5+2/5x5-2/5
=2/5x(2+4+5-1)
=2/5x10
=4
\(\dfrac{2}{5}\times2+4\times\dfrac{2}{5}+\dfrac{2}{5}\times5-\dfrac{2}{5}\\ =\left(2+4+5-1\right)\times\dfrac{2}{5}\\ =10\times\dfrac{2}{5}\\ =4\)
a) = ……………………………3/7 x 4/5………………………… | 2/5 + 3/4 ………………………..……….…..…………………… |
b) =……2/5 : 4……………………………………….…………… | ……1/4 + 2………………….……….………………………… |
c) =…2/5 : 2/3……………………………………..…………..… | 2/3 - 38…………………………………………………………… |
d) 5 - 2/3………………………………………..…..………… | 2/5 x 3………………………………………………………… |
a.2/3 × 5/4 + 2/3 × 4/5 = ........ × ( 5/4 + 4/5 )
b. 5/2 × (3/7 + 1/5 ) = ...
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
a)2/5 + 3/4 e) 1/4+2
b)2/3 - 3/8 g)2/5 nhân 3
c)3/7 nhân 4/5 f)2/5:4
d)2/5:2/3 5-2/3
làm bước trung gian cho mình luôn nhé
d)2/5 : 2/3
c)3/7 nhân 4/5
d)2/5 : 2/3
bài 1:
1/4 + 2/3 2/7 + 2/3 2/5 + 1/3 2/3 + 1/2 1/3 + 3/5 4/5 + 1/3
1/8 + 3/4 1/36 + 5/12 1/3 + 1/6 + 1/18.
bài 2:
15/16 - 3/16 17/18 - 5/6 3/4 - 4/9 1/2 - 2/5 5/6 - 3/10 3-1/3
4/5 - 1/10 5/2 - 1 5/8 - 2/5.
Tìm x biết :
x + 4/5 = 4/5 + ( 3/7 + 3/5 ) 5/7 + x/35 = 4/5
x < 3/4 + 2 2/3 + 1 < x < 5/6 + 4
x< 5/6 - 3/4 2/3 < x < 2 - 5/6
Bài 2. a, Các phân số được sắp xếp theo thứ tự từ bé đế lớn là:
A, 2/3; 5/6; 4/2 B, 5/6; 4/2; 2/3 C, 4/2; 5/6; 2/3 D, 2/3; 4/2; 5/6.
b, Các phân số được sắp xếp theo thứ tự từ lớn đến bé là:
A, 2/3; 5/6; 4/2 B, 5/6; 4/2; 2/3 C, 4/2; 5/6; 2/3 D, 2/3; 4/2; 5/6.
Tính bằng hai cách :
( 5/4 + 2/5 ) : 5/6 =
3/4 x 2/5 - 3/4 x 2/7 =
2/3 : ( 5/6 x9/10 ) =
1/2+{1/3+2/3}+{1/4+2/4+3/4}+1/5+2/5+3/5+4/5}
