2.8+2.3=? =))
K
Khách
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S
13 tháng 3 2017
1,2 + 2,3 + 2,4 + 2,5 + 2,6 + 2,7 + 2,8
= (1,2 + 2,8) + (2,3 + 2,7) + (2,4 + 2,6) + 2,5
= 4 + 5 + 5 + 2,5
= 4 + 10 + 2,5
= 14 + 2,5
= 16,5
ủng hộ tớ nha
13 tháng 2 2016
2,3:2,8xX=57,5
\(\frac{23}{28}\)xX=57,5
X=57,5:\(\frac{23}{28}\)
X=70
20 tháng 9 2018
\(\frac{5^2\cdot3^3-25\cdot17}{25\cdot3^2-5^2\cdot8}\)
\(=\frac{25\cdot\left(27-17\right)}{25\left(9-8\right)}\)
\(=\frac{25\cdot17}{25\cdot1}\)
\(=17\)
20 tháng 9 2018
Nhầm đoạn cuối :
\(=\frac{25\cdot10}{25\cdot1}\)
\(=10\)
Sorry ( ko gạch đá )
H
0
LT
1
NN
5 tháng 9 2016
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height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300">
CD
1
VT
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.
PT
1
Mik ko hiểu cái dấu chấm kia là nhân hay phẩy nên mik làm vậy nka:
_2x8+2x3=22
_2,8x2,3=6,44
Hok tốt!
2.8+2.3=16+6=22