31/35 - 2/7= ..... ; 8/7:2/7=.....
tính:
2/7+3/5
31/35-2/7
31/35-2/5
3/5+2/7
đầy đủ tick
2/7 + 3/5
= 10/35 + 21/35
= 31/35
31/35 - 2/7
= 31/35 - 10/35
= 21/35
= 3/5
31/35 - 2/5
= 31/35 - 14/35
= 17/35
3/5 + 2/7
= 21/35 + 10/35
= 31/35
2/7 + 3/5 = 10/35 + 21/35 = 31/35
31/35 - 2/7 = 31/35 - 10/35 = 21/35
31/35 - 2/5 = 31/35 - 21/35 = 10/35
3/5 + 2/7 = 21/35 + 10/35 = 31/35
2/7+3/5 =31/35
31/35-2/7=21/35
31/35-2/5=17/35
3/5+2/7=31/35
nhớ tích cho minh nhé mình kb cho mình là con gái
Tính:
31/35 - 2/7
Tính:
a) 6 - 2/5 + 3/5 x 3
b) ( 31/35 - 4/7 ) x 8/7 : 2
a) \(6-\dfrac{2}{5}+\dfrac{3}{5}\) x \(3\)
\(=6-\dfrac{2}{5}+\dfrac{9}{5}\)
\(=\dfrac{30}{5}-\dfrac{2}{5}+\dfrac{9}{5}\)
\(=\dfrac{30-2+9}{5}=\dfrac{37}{5}\)
b) \(\left(\dfrac{31}{35}-\dfrac{4}{7}\right)\) x \(\dfrac{8}{7}:2\)
\(=\left(\dfrac{31}{35}-\dfrac{20}{35}\right)\) x \(\dfrac{8}{7}:2\)
\(=\dfrac{11}{35}\) x \(\dfrac{8}{7}:2\)
\(=\dfrac{11}{35}\) x \(\dfrac{8}{7}\) x \(\dfrac{1}{2}\)
\(=\dfrac{\text{11 x 8 x 1}}{\text{ 35 x 7 x 2}}=\dfrac{88}{490}=\dfrac{88}{245}\)
a) 6−25+356−25+35 x 33
=6−25+95=6−25+95
=305−25+95=305−25+95
=30−2+95=375=30−2+95=375
b) (3135−47)(3135−47) x 87:287:2
=(3135−2035)=(3135−2035) x 87:287:2
=1135=1135 x 8
Tính nhanh:
a) A=131*(35-207)-35*31+131*207
b) B=2^15*7-2^16/5*2^15
Tính:
A]2/5 + 1/2
B]4/3 - 2/7
C]31/35 - 2/7
D]2 - 1/4
E]4/5 + 3
31/35-2/7=.........(nhập kết quả bằng phân số tối giản)
ta có : \(\frac{2}{7}\)= \(\frac{10}{35}\)
vậy \(\frac{31}{35}\)- \(\frac{10}{35}\)= \(\frac{21}{35}\)
mà \(\frac{21}{35}\)= \(\frac{3}{5}\)
vậy SCT là \(\frac{3}{5}\)
rút gọn
31 .7 -31/4-35
\(\frac{31\cdot7-31}{4-35}=\frac{31\cdot(7-1)}{4-35}=\frac{31\cdot6}{4-35}=\frac{31\cdot2\cdot3}{4-35}=\frac{186}{-31}=-6\)
P/S : Hoq chắc :>
\(\frac{31.7-31}{4-35}=\frac{31.\left(7-1\right)}{-31}=\frac{31.6}{-31}=\frac{1.6}{-1}=\frac{6}{-1}=-6\)
Tính :
a) 6 - 2 / 5 + 3 / 5 x 3
b) ( 31 / 35 - 4 / 7 ) x 8 / 7 ; 2
\(\frac{6-2}{5}+\frac{3}{5.3}\)
\(=\frac{4}{5}+\frac{1}{5.1}\)
\(=\frac{4}{5}+\frac{1}{5}\)
\(=\frac{5}{5}=1\)
a. 6 x 3 - ( \(\frac{2}{5}+\frac{3}{5}\)) = 6 x 3 - \(\frac{5}{5}\)= 6 x 3 - 1 = 18 - 1 = 17
b.( \(\frac{31}{35}-\frac{4}{7}\)) x \(\frac{8}{7}\): 2 =\(\frac{11}{35}\)x \(\frac{8}{7}\): 2 =\(\frac{88}{245}\): 2 = \(\frac{88}{490}\)= \(\frac{44}{245}\)= ...........rút gọn đến khi hết
Tính :
a) 6 - 2 / 5 + 3 / 5 x 3
b) ( 31 / 35 - 4 / 7 ) x 8 / 7 ; 2
a) \(6-\frac{2}{5}+\frac{3}{5}\times3\)
\(=6-\frac{2}{5}+\frac{9}{5}\)
\(=\frac{30}{5}-\frac{2}{5}+\frac{9}{5}\)
\(=\frac{28}{5}+\frac{9}{5}\)
\(=\frac{37}{5}\)
b) \(\left(\frac{31}{35}-\frac{4}{7}\right)\times\frac{8}{7}:2\)
\(=\frac{11}{35}\times\frac{8}{7}:2\)
\(=\frac{88}{245}:2\)
\(=\frac{44}{245}\)