Tính hợp lý : 111+(689+875)+12
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(689 + 875) + 125 = 689 + (875 + 125) = 689 + 1000 = 1689.
581 + (878 + 419) = (581 + 419) = 878 = 1000 + 878 = 1878.
`125+231+319+769+875+681`
`= (125+875) + ( 231+769) + ( 319+681 ) `
`= 1000 + 1000 + 1000 `
`= 3000`
125+231+319+769+875+681
=(125+875)+(231+769)+(319+681)
=1000+1000+1000
=3000
a, \(=\dfrac{2}{9}-\dfrac{10}{10}=\dfrac{2}{9}-1=-\dfrac{7}{9}\)
b, \(=-\dfrac{12}{6}+\dfrac{2}{5}=-2+\dfrac{2}{5}=-\dfrac{8}{5}\)
c, \(=\dfrac{27}{13}-1=\dfrac{14}{13}\)
d, \(=\dfrac{12}{11}+\dfrac{7}{19}+\dfrac{12}{19}=\dfrac{12}{11}+1=\dfrac{23}{11}\)
\(\frac{5}{6}+\frac{7}{12}=\frac{10}{12}+\frac{7}{12}=\frac{17}{12}\)
\(3+\frac{5}{7}=\frac{21}{7}+\frac{5}{7}=\frac{26}{7}\)
(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
36 x 333 - 108 x 111
= ( 36 x 3 ) x ( 333 : 3 ) - 108 x 111
= 108 x 111 - 108 x 111
= 0
111+(689+875)+12
= 111 + 1564 + 12
= 1675 + 12
= 1687
1687