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
