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a) 6,75kg x 3 =20,25kg
b) 7,14m^2 x 5= 35,7 m^2
c) 9,26dm^3 x 10= 92,6 dm^3
\(3\frac{2}{5}=\frac{3\cdot5+2}{5}=\frac{17}{5}\)
\(2\frac{1}{7}=\frac{2\cdot7+1}{7}=\frac{15}{7}\)
\(8\frac{1}{6}=\frac{8\cdot6+1}{6}=\frac{49}{6}\)
\(2\frac{1}{2}=\frac{2\cdot2+1}{2}=\frac{5}{2}\)
\(3\frac{2}{5}\cdot2\frac{1}{7}=\frac{17}{5}\cdot\frac{15}{7}=\frac{51}{7}\)
\(8\frac{1}{6}:2\frac{1}{2}=\frac{49}{6}:\frac{5}{2}=\frac{49}{6}\cdot\frac{2}{5}=\frac{49}{15}\)
a) 6,75kg + 6,75kg + 6,75kg = 6,75kg x 3 = 20,25kg
b) 7,14 m2 + 7,14 m2 + 7,14 m2 = 7,14 m2 x 3 = 21,42 m2
c) 9,26 dm3 x 9 + 9,26 dm3 = 9,26 dm3 x ( 9 + 1 ) = 9,26 dm3 x 10 = 92,6 dm3
3/2+5/3
=19/6
8/3-11/7
=23/21
8/3*21/4
=168/12=14
7/2:9/4
=7/2*4/9
=28/18=10//9
\(1\frac{1}{2}+1\frac{1}{3}=\frac{3}{2}+\frac{4}{3}=\frac{9}{6}+\frac{8}{6}=\frac{17}{6}\)
\(2\frac{2}{3}-1\frac{4}{7}=\frac{8}{3}-\frac{11}{7}=\frac{56}{21}-\frac{33}{21}=\frac{23}{21}\)
\(2\frac{2}{3}\cdot5\frac{1}{4}=\frac{8}{3}.\frac{21}{4}=14\)
\(3\frac{1}{2}:2\frac{1}{4}=\frac{7}{2}:\frac{9}{4}=\frac{7}{2}.\frac{4}{9}=\frac{14}{9}\)
a)13x3x32,27+67,63x39
=39x32,27+67,63x39
=39x(32,27+67,63)
=39x100
=3900
b,= 1- [ 1/2 x 1/3 x1/4 x..... x 1/100 ]
=1/2 x 2/3 x 3/4 x .......x 99/100
= 1x2x3x......x99 / 2x3x4x...... x100 [ rút gọn ]
= 1/100
7,14m2 + 7,14m2 + 7,14m2 x 3 = 7,14m2 x ( 1 + 1 +3) = 7,14m2 x 5 = 35,7m2