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30 tháng 8 2015
a) 3/5x7/8:10/9=21/40:10/9=189/400
b) 3 2/7x2 1/4:1 2/5=23/7x9/4:7/5=207/28:7/5=1035/196
c) 6/9+24/15+12/9+6/15=34/15+12/9+6/15=18/5+6/15=4
d) 3 2/9-( 1 5/8+1 2/9 )=29/9-(13/8+11/9)=29/9-205/72=3/8
22 tháng 4 2016
a) C1: 8/15 : 4/5 + 7/15 : 4/5 C2: 8/15 : 4/5 + 7/15 : 4/5
= (8/15 + 7/15) :4/5 = 2/3 + 7/12
= 1 : 4/5 =5/4
= 5/4
b) C1: (5,8 + 4,7) : 0,25 C2: (5,8 + 4,7) : 0,25
= 10,5 : 0,25 = 5,8 : 0,25 + 4,7 : 0,25
= 42 = 23,2 + 18,8
= 42
c)C1: (7/3 - 2/3) : 4/9 C2: (7/3 - 2/3) : 4/9
= 5/3 : 4/9 = 7/3 : 4/9 - 2/3 : 4/9
= 15/4 = 21/4 - 3/2
= 15/4
d) C1: 0,08 : 0,16 - 0,04 : 0,16 C2: 0,08 : 0,16 - 0,04 : 0,16
= 1/2 - 1/4 = (0,08 - 0,04) : 0,16
= 1/4 = 0,04 : 0,16
=1/4
Nhớ k mình nha
18 tháng 5 2016
a) 3/5x7/9+11/9x3/5
=3/5 x(7/9+11/9)
= 3/5x2
=6/5
b)14/13:1/2+3/13x2-2x7/13
= 14/13 x 2 +3/13 x2 - 2x7/13
=2 x (14/13 +3/13 -7/13)
= 2 x 10/13
= 20/13
18 tháng 5 2016
a) 3/5 x 7/9 + 11/9 x 3/5 - 3/10
= 3/5 x 7/9 + 11/9 x 3/5 - 3/5 x 2
= 3/5 x ( 7/9 + 11/9 - 2 )
= 3/5 x 0
= 0
b) 14/13 : 1/2 + 3/13 x 2 - 2 x 7/13
= 14/13 x 2/1 + 3/13 x 2 - 2 x 7/13
= ( 14/13 + 3/13 - 7/13 ) x 2
= 10/13 x 2 = 20/13
DN
1
CN
14 tháng 4 2016
9/8 : 27/16 =2/3
C1: 9/5:17/15 + 8/5 : 17/15
= 27/15 + 24/15
=3
C2: 9/5 : 17/15 + 8/5 : 17/15
= ( 9/5 + 8/5 ) : 17/15
= 17/5 : 17/15
= 3
AH
12 tháng 11 2016
x - 5 / 6 = 12 / 7
x = 12 / 7 + 5 / 6
x = 107 / 42
x + 4 / 5 = 8 / 3
x = 8 / 3 - 4 / 5
x = 28 / 15
x * 3 / 9 = 11 / 7 - 3 / 4
x * 3 / 9 = 23 / 28
x = 23 / 28 : 3 / 9
x = 69 / 28
5 / 9 : x = 1 / 3 + 2 / 5
5 / 9 : x = 11 / 15
x = 5 / 9 : 11 / 15
x = 25 / 33
\(1\frac{3}{4}-x=\frac{3}{8}\)
x = 11 / 8
15 , 21 - x = 5 , 6 + 1 , 2
15 , 21 - x = 6 , 8
x = 15 , 21 - 6 , 8
x = 8 , 41
C1 : ( 6 , 75 + 3 , 25 ) * 42
= 10 * 42
= 420
C 2 : ( 6 , 75 + 3 , 25 ) * 42
= 6,75 * 42 + 3,25 * 42
= 283 , 5 + 136 , 5
= 4200
C 1 : ( 9 , 6 - 4 , 2 ) * 3 , 6
= 5 , 4 * 3 , 6
= 19 , 44
C 2 : ( 9 , 6 - 4 , 2 ) * 3 , 6
= 9 , 6 * 3 , 6 - 4 , 2 * 3 , 6
= 34 , 56 - 15 , 12
= 19 , 44
a) Cách 1
\(\frac{8}{15}:\frac{2}{3}+\frac{7}{15}:\frac{2}{3}\)
\(=\frac{8}{15}.\frac{3}{2}+\frac{7}{15}.\frac{3}{2}\)
\(=\frac{4}{5}+\frac{7}{10}=\frac{3}{2}\)
Cách 2
\(\frac{8}{15}:\frac{2}{3}+\frac{7}{15}:\frac{2}{3}\)
\(=\left(\frac{8}{15}+\frac{7}{15}\right).\frac{3}{2}\)
\(=1.\frac{3}{2}=\frac{3}{2}\)
a) C1: 8/15 : 2/3 + 7/15 : 2/3
= 4/5 + 7/10
= 3/2
C2: 8/15 : 2/3 + 7/15 : 2/3
= ( 8/15 + 7/15 ) : 2/3
= 1 : 2/3
= 3/2
b) C1: 4/9 x 3/5 + 5/9 x 3/5
= 4/15 + 1/3
= 3/5
C2: 4/9 x 3/5 + 5/9 x 3/5
= ( 4/9 + 5/9 ) x 3/5
= 1 x 3/5
= 3/5
Chúc bạn học tốt :)
a,8/15:2/3+7/15:2/3
Cách 1: 8/15:2/3+7/15:2/3
=(8/15+7/15):2/3
=1:2/3
=3/2
Cách 2: 8/15:2/3+7/15:2/3
=8/15x3/2+7/15x3/2
=3/2x(8/15+7/15)
=3/2x1
=3/2
b, Cách 1:
4/9x3/5+5/9x3/5
=(4/9+5/9)x3/5
=1x3/5
=3/5
Cách 2:
4/9x3/5+5/9x3/5
=12/45+15/45
=27/45
=3/5
a)
C1: 8/15 : 2/3 + 7/15 : 2/3
= 4/5 + 7/10
= 3/2
C2: 8/15 : 2/3 + 7/15 : 2/3
= (8/15 + 7/15) * 3/2
= 3/2
b)
C1: 4/9 x 3/5 + 5/9 x 3/5
= 4/15 + 1/3
= 3/5
C2: 4/9 x 3/5 + 5/9 x 3/5
= (4/9 + 5/9) x 3/5
= 3/5
\(\frac{4}{9}\times\frac{3}{5}+\frac{5}{9}\times\frac{3}{5}\\ =\frac{3}{5}\times\left(\frac{4}{9}+\frac{5}{9}\right)\\ =\frac{3}{5}\times1\\ =\frac{3}{5}\)
\(\frac{8}{15}:\frac{2}{3}+\frac{7}{15}:\frac{2}{3}\)
Cách 1:\(\frac{8}{15}.\frac{3}{2}+\frac{7}{15}.\frac{3}{2}\)
= \(\frac{4}{5}+\frac{7}{10}=\frac{8+7}{10}=\frac{3}{2}\)
Cách 2: \(\frac{8}{15}.\frac{3}{2}+\frac{7}{15}.\frac{3}{2}=\frac{3}{2}.\left(\frac{8+7}{15}\right)\)
= \(\frac{3}{2}.1=\frac{3}{2}\)
b) \(\frac{4}{9}.\frac{3}{5}+\frac{5}{9}.\frac{3}{5}\)
Cachs1: \(\frac{4}{9}.\frac{3}{5}+\frac{5}{9}.\frac{3}{5}=\frac{4}{15}+\frac{5}{15}=\frac{3}{5}\)
Cách 2: \(\frac{4}{9}.\frac{3}{5}+\frac{5}{9}.\frac{3}{5}=\frac{3}{5}.\left(\frac{4+5}{9}\right)=\frac{3}{5}.1=\frac{3}{5}\)
K nhaaaaaaaaaaaa
a) cách 1: 8/15 : 2/3 +7/15:2/3 = (8/15 +7/15 ) :2/3 cách 2: 8/15:2/3 + 7/15:2/3=4/5 + 7/10
= 1:2/3 = 3/2 = 3/2
b) cách 1: 4/9 x 3/5 + 5/9 x3/5 =(4/9+5/9) x 3/5 cách 2: 4/9 x 3/5 + 5/9 x3/5 =4/15 + 1/3
=1 x3/5=3/5 =4/15 + 5/15= 3/5
a) Cách 1 :
\(\frac{8}{15}:\frac{2}{3}+\frac{7}{15}:\frac{2}{3}\)
\(=\frac{4}{5}+\frac{7}{10}\)
\(=\frac{3}{2}\)
Cách 2
\(\frac{8}{15}:\frac{2}{3}+\frac{7}{15}:\frac{2}{3}\)
\(=\left(\frac{8}{15}+\frac{7}{15}\right):\frac{2}{3}\)
\(=1:\frac{2}{3}\)
\(=\frac{3}{2}\)
b) cách 1 :
\(\frac{4}{9}\times\frac{3}{5}+\frac{5}{9}\times\frac{3}{5}\)
\(=\frac{4}{15}+\frac{1}{3}\)
\(=\frac{3}{5}\)
Cách 2 :
\(\frac{4}{9}\times\frac{3}{5}+\frac{5}{9}\times\frac{3}{5}\)
\(=\left(\frac{4}{9}+\frac{5}{9}\right)\times\frac{3}{5}\)
\(=1\times\frac{3}{5}\)
\(=\frac{3}{5}\)
Nếu thấy đúng thì k mk nha