58*77+58*13+58*10-18*50+18*50=..........?
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12 + 14 + 16 + 18 + 20 + ... + 50 + 52 + 54 + 56 + 58
= ( 12 + 58 ) + ( 14 + 56 ) + ... + ( 34 + 36 )
= 70 + 70 + ... + 70
= 70 x 12
= 840
~ Hok tốt ~
=(12+58)+(14+56)+(16+54)+....+(30+30)
= 60 + 60 + 60 +.....+ 60
= 60 x 12
= 720
Hok tốt nha
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3.23 + 18 : 23 . 22= 3 . 8 + 18 : 8 . 4 = 21 +2,25.4=21+9=30
407+ [(180- 160) : 4 + 32 ]=407+ [(180- 160) : 4 + 9 ]=407+14=421
58 . 75 + 58 . 50 - 58 . 25=58 . (75 + 50 - 25)=58.100=5800
khỏi chép đề nha
a) = 32,768 + 18 : 8 . 4
= 32,768 + 2,25 . 4
= 32,768 + 9
= 41,768
b) = 407 + ( 20 : 4 + 9 )
= 407 + ( 5 + 9 )
= 407 + 14
= 421
c) = 58 . ( 75 + 50 - 25 )
= 58 . 100
= 5800
tk nha
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1. b, F = 27 + 58.26
<=> F = 27 + 58.(25 + 1)
<=> F = 27 + 58.25 + 58
<=> F = 58.25 + 85 > E
@Lien Anh Le
2. a, 18.39 + 36.81
= 18.39 + 18.2.81
= 18.(39 + 162)
= 18.201
= 3618
b, 23.82 + 109.77 - 18.77
= 23.82 + 77(109 - 18)
= 23.82 + 77.91
= 1886 + 7007
= 8893
@Lien Anh Le
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Lời giải:
$A=(-3)+8+(-13)+18+...+(-53)+58$
$=[(-3)+8]+[(-13)+18]+...+[(-53)+58]$
$=5+5+....+5$
Số lần xuất hiện của 5 là: $[(58-3):5+1]:2=6$
$A=5.6=30$
![](https://rs.olm.vn/images/avt/0.png?1311)
\(58\times57+58\times50-58\times25=58\times\left(57+50-25\right)=4756\)
58 × 57 + 58 × 50 - 58 × 25
= 58 × (57 + 50 - 25)
= 58 × 82
= 4756
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{1}{7}-\left(-\dfrac{3}{5}\right)+\dfrac{6}{7}-\left|-\dfrac{1}{5}\right|=1+\dfrac{3}{5}+\dfrac{1}{5}=\dfrac{9}{5}\\ \dfrac{8}{13}\cdot\dfrac{11}{18}+\dfrac{7}{18}\cdot\dfrac{8}{13}-1\dfrac{8}{13}=\dfrac{8}{13}\left(\dfrac{11}{18}+\dfrac{7}{18}+1\right)=\dfrac{8}{13}\cdot2=\dfrac{16}{13}\)
\(\dfrac{1}{7}-\left(-\dfrac{3}{5}\right)+\dfrac{6}{7}-\left|-\dfrac{1}{5}\right|\)
\(=\dfrac{1}{7}+\dfrac{3}{5}+\dfrac{6}{7}-\dfrac{1}{5}\)
\(=1+\dfrac{2}{5}=\dfrac{7}{5}\)
=58*(77+13+10)-18*(50+50)
=58*100-18*100
=5800-1800
=4000
58*77+58*13+58*10-18*50+18*50
= 58 x ( 77 + 13 + 10 ) - 18 x ( 50 + 50 )
= 58 x 100 - 18 x 100
= 5800 - 1800
= 4000