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a)
(1/3-1/5)x1/4 = 1/3x1/4-1/5x1/4=1/12-1/20=1/30
(1/3-1/5)x1/4 = 2/15x1/4=1/30
b)
2/5 x 3/7 + 2/5 x 4/7= 6/35 + 8/35 = 14/35 = 2/5
2/5 x 3/7 + 2/5 x 4/7= (3/7+4/7) x 2/5 = 1 x 2/5 = 2/5
a: C1: (1/3-1/5)*1/4
=2/15*1/4=2/60=1/30
C2: (1/3-1/5)*1/4
=1/3*1/4-1/5*1/4
=1/12-1/20=1/30
b: C1: 2/5*3/7+2/5*4/7
=6/35+8/35=14/35=2/5
C2: 2/5*3/7+2/5*4/7
=2/5(3/7+4/7)
=2/5*1=2/5
=>3/6+4/6<x<16/4-5/4 K NHA MOI NGUOI
=>7/6<x<11/4
=>28/24<x<66/24
=>x=48/24=2
[6: 3/5 - 7/6 x 6/7] : [ 21/5 x 10/11 + 57/11]
= 9 : 9
= 1
\(\left(6:\frac{3}{5}-\frac{7}{6}\times\frac{6}{7}\right):\left(\frac{21}{5}\times\frac{10}{11}+\frac{57}{11}\right)\)
\(=\left(10-1\right):\left(\frac{42}{11}+\frac{57}{11}\right)\)
\(=9:9\)
\(=1\)
\(\frac{4}{5}:\frac{7}{4}< x< \frac{2}{5}.\frac{10}{3}\)
\(\frac{16}{35}< x< \frac{4}{3}\)
=> x=1
a) \(\frac{4}{5}=\frac{28}{35}\)
b) \(\frac{12}{15}=\frac{72}{90}\)
c) \(\frac{125}{300}=\frac{5}{12}\)
d) \(\frac{6}{9}=\frac{36}{54}\)
/HT\
a) \(\frac{4}{5}=\frac{28}{35}\) \(\text{X}=28\)
b) \(\frac{12}{15}=\frac{72}{90}\) \(\text{X}=90\)
c) \(\frac{125}{300}=\frac{5}{12}\) \(\text{X}=12\)
d) \(\frac{6}{9}=\frac{36}{54}\) \(\text{X}=6\)
\(\dfrac{5}{3}\)=\(\dfrac{35}{21}\)
\(\dfrac{5}{7}\):\(\dfrac{1}{3}\)=\(\dfrac{15}{7}\)=\(\dfrac{45}{21}\)
=>x=36/21,37/21,38/21,39/21,40/21,41/21,42/21,43/21,44/21