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\(8,6-x-4,2=0,56\)
\(8,6-x=0,56+4,2=4,76\)
\(x=8,6-4,75=3,85\)
8,6 - x - 4,2 = 0,56
4,4 - x = 0,56
x = 4,4 - 0,56
x = 3,84
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6 2/7 + 7 3/5 + 8 6/9 + 9 1/4 + 2/5 + 5/7 + 1/3 x 3/4 + 1967
= 44/7 + 38/5 + 78/9 + 37/4 + 2/5 + 5/7 + 1/3 + 1967
= ( 44/7 + 5/7 ) + ( 38/5 + 2/5 ) + ( 26/3 + 1/3 ) + ( 37/4 + 3/4 ) +1967
= 7 + 8 + 9 + 10 + 1967
= 15 + 9 + 10 + 1967
= 24 + 10 + 1967
= 34 + 1967
= 2001
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3 x 4 + 12 x 19 + 6 x 66 x2
= 12 + 12 x 19 + 6 x 66 x2
= 12 x ( 1 +19 ) + 6 x 66 x2
= 12 x 20 + 6 x 2 x 66
= 12 x 20 + 12 x 66
= 12 x ( 20 + 66 )
= 12 x 86
=1032
k mik nha bn
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18 x 123 + 9 x 456 x 2 + 3 x 5311 x 6
= 18 x 123 + ( 9 x 2 ) x 456 + ( 3 x 6 ) x 5311
= 18 x 123 + 18 x 456 + 18 x 5311
= 18 x ( 123 + 456 + 5311 )
= 18 x 5890
= 106020
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a) 2014 x 7 + 2 x 2014 + 2014
= 2014 x ( 7+2+1)
= 2014 x 10 = 20140
b) 4/7 - 9/7 - 2/7 x 4
= (4-9-2) / 2 x 4
= (-7) : 2 x 4 = -7 x 2 = -14
a. 2014x7+2x2014+2014
=2014x7+2x2014+2014x1
=2014x(2+7+1)
=2014x10
=20140
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6,32 x 97 + 6,32 x 2 + 6,32
= 6,32 x (97 + 2 + 1)
= 6,32 x 100
=632
Trả lời ::...............................................
1245,04........................................
Hk tốt,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
k nhé
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\(\frac{1}{1\times2}+\frac{1}{2\times3}+\frac{1}{3\times4}+\frac{1}{4\times5}+\frac{1}{5\times6}\)
\(=\frac{2-1}{1\times2}+\frac{3-2}{2\times3}+\frac{4-3}{3\times4}+\frac{5-4}{4\times5}+\frac{6-5}{5\times6}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\)
\(=1-\frac{1}{6}=\frac{5}{6}\)
mình ko viết lại đầu bài nhé
= 1 - 1/2 + 1/2 -1/3 + 1/3 - 1/4 + 1/4 - 1/5 + 1/5 - 1/6
= 1 - 1/6 = 5/6
trong phép tính đầu mỗi số hạng mk tách làm 1 hiệu nhé
8,2 x 23,6 + 76,4 x 8,2
= 8,2x (23,6 + 76,4)
= 8,2 x 100
=820