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1.
= 10 000 - 29 x 11
= 10 000 - 319
= 9681
2.
= ( 3/7 + 4/7 ) + ( 4/9 + 5/9 )
= 1 + 1
= 2
C1:
(1/4+1/7)x1/3=11/28x1/3
=11/84
C2:
(1/4=1/7)x1/3=1/3x1/4+1/3x1/7
=1/12+1/21
=11/84
cho mk nhé, có fb kb vs mk đi nè <3 <3
C1 : 11/28 x 1/3 =11/84
C2 : 1/4 x1/3 + 1/7 x 1/3 = 11/84
C1 : 3/28 x 1/3 =1/28
C2 1/4 x1/3 - 1/7 x 1/3 =1/28
a) 2/5 + 1/2 + 7/10
= 4/10 + 5/10 + 7/10
= 9/10 + 7/10
= 16/10 = 8/5
b) 4/9 + 11/8 - 5/6
= 32/72 + 99/72 - 60/72
= 191/72
c) 9/20 - 8/15 x 5/12
= 9/20 - 2/9
= 41/180
d) 2/3 : 4/5 : 7/12
= 5/6 : 7/12
= 10/7
Cách 1 : \(\left(\frac{1}{4}-\frac{1}{7}\right)\times\frac{1}{3}\)
\(=\frac{3}{28}\times\frac{1}{3}\)
\(=\frac{1}{28}\)
Cách 2:\(\left(\frac{1}{4}-\frac{1}{7}\right)\times\frac{1}{3}\)
\(=\frac{1}{4}\times\frac{1}{3}-\frac{1}{7}\times\frac{1}{3}\)
\(=\frac{1}{12}-\frac{1}{21}\)
\(=\frac{1}{28}\)
\(\frac{9}{10}+\frac{7}{9}+\frac{5}{8}+\frac{3}{7}+\frac{3}{5}+\frac{2}{5}+\frac{4}{7}+\frac{3}{8}+\frac{2}{9}+\frac{1}{10}\)\(\frac{1}{10}\)
= ( 9/10 + 1/10 ) + ( 7/9 + 2/9 ) + ( 5/8 + 3/8 ) + ( 3/7 + 4/7 ) + ( 3/5 + 2/5 )
= 1 + 1 + 1 + 1 + 1
= 1 x 5
= 5
\(\left(\frac{9}{10}+\frac{1}{10}\right)+\left(\frac{7}{9}+\frac{2}{9}\right)+\left(\frac{5}{8}+\frac{3}{8}\right)+\left(\frac{3}{7}+\frac{4}{7}\right)+\left(\frac{3}{5}+\frac{2}{5}\right)\)2/5)
=1+1+1+1+1=5
.
C1: 3/7×16/33+16/33×4/7
= 16/33×(3/7+4/7)
= 16/33×7/7
= 16/33×1=16/33
C2: 3/7×16/33+16/33×4/7
= 16/7×3/33+4/33×16/7
= 16/7×(3/33+4/33)
= 16/7×7/33
= 16/33
T i c k cho "chị" nha em! ^o^
\(\left(\dfrac{1}{4}+\dfrac{1}{7}\right)\times\dfrac{1}{3}\\ =\left(\dfrac{7}{28}+\dfrac{4}{28}\right)\times\dfrac{1}{3}\\ =\dfrac{11}{28}\times\dfrac{1}{3}\\ =\dfrac{11}{84}\)
=11/28x1/3=11/84