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a) 19/37 + (1 - 19/37)
= (19/37 - 19/37) + 1
= 0 + 1 = 1
b) 15,27 - 4,13 - 1,14
= 15,27 - ( 4,13 + 1,14)
= 15,27 - 5,27
= 10
c) 60 - 13,75 - 26,25
= 60 - ( 13,75 + 26,25)
= 60 - 40
= 20
\(\frac{5}{6}+\frac{7}{12}=\frac{10}{12}+\frac{7}{12}=\frac{17}{12}\)
\(3+\frac{5}{7}=\frac{21}{7}+\frac{5}{7}=\frac{26}{7}\)
(689+875)+125=689+875+125=689+1000=1689
581+(878+419)=581+878+419=581+419+878=1000+878=1878
5,87+28,69+4,13=5,87+4,13+28,69=10+28,69=38,69
83,75+46,98+6,25=83,75+6,25+46,98=90+46,98=136,98
5/6 + 7/12 = 17/12
3 + 5/7 = 26/7
926,83 + 549,67 = 1476.5
(689 + 875) + 125 = 689 + (875 + 125) = 1689
581 + (878 + 419) = (581 + 419) + 878 = 1878
5,87 + 28,69 + 4,13 = (5,87 + 4,13) + 28,69 = 38,69
83,75 + 46,98 + 6,25 =( 83,75 + 6,25) + 46,98 = 136,98
a) 3/8 x 14/53 x 8/3
=3/8x8/3x14/53
= 1 x 14/53
=14/53
b) 9/17x1/5+9/17x4/5
=9/17x(1/5+4/5)
=9/17x 5/5
=9/17x1
= 9/17
Li-ke cho mik nhé!
1.
\(a,\frac{1}{7}+\frac{3}{4}+\frac{2}{7}+\frac{4}{7}=\frac{1}{7}+\frac{2}{7}+\frac{4}{7}+\frac{3}{4}\)
\(=1+\frac{3}{4}=\frac{7}{4}.\)
\(b,\frac{4}{7}:\frac{2}{5}+\frac{3}{7}:\frac{2}{5}-\frac{7}{9}=\left(\frac{4}{7}+\frac{3}{7}\right):\frac{2}{5}-\frac{7}{9}\)
\(=1:\frac{2}{5}-\frac{7}{9}=\frac{5}{2}-\frac{7}{9}\)
\(=\frac{31}{18}.\)
a)3/4+(1/7+2/7+4/7)
=3/4+1
=7/4
b)2/5:(4/7+3/7)-7/9
=2/5:1-7/9
=2/5-7/9
=-17/45
a) 9/8 + 7/8 - (17/7 - 3/7) = 16/8 - 14/7 = 2 - 2 = 0
b) (15,27 - 1,14) - 4,13 = 14,13 - 4,13 = 10
c) (60 - 13,75) - 26,25 = 46,25 - 26,25= 20
ai mk mk lại