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12 tháng 6 2016

\(\frac{4,5\times16-1,7}{4,5\times15+2,8}=\frac{4,5\times15+4,5-1,7}{4,5\times15+2,8}\)

\(=\frac{4,5\times1,5+2,8}{4,5\times1,5+2,8}\)

\(=1\)

12 tháng 6 2016

\(\frac{4,5.16-1,7}{4,5.15+2,8}\)

\(=\frac{4,5.15+4,5-1,7}{4,5.15+2,8}\)

\(=\frac{4,5.1,5+2,8}{4,5.1,5+2,8}\)

\(=1\)

5 tháng 9 2016

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23 tháng 8 2016

a) 6,3 + (-3,7) + 2,4 + (-0,3)

= (6,3 + 2,4) + [-3,7 + (-0,3)]

= 8,7 + (-4)

=  4,7

b) (-4,9) + 5,5 + 4,9 + (-5,5)

= (-4,9 + 4,9) + [5,5 + (-5,5)]

= 0 + 0

= 0

c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2

= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7

= 0 + 0 + 3,7

= 3,7

d) (-6,5) . 2,8 + 2,8 . (-3,5)

= 2,8 . [-6,5 + (-3,5)]

= 2,8 . (-10)

= -28.

7 tháng 9 2017

7 tháng 10 2021

2.8 là 2,8 nha

\(\left(5.3-2.8\right)-\left(4+5.3\right)\)

\(=2.5-4-5.3\)

=-6.8