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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
\(\frac{1}{10}+\frac{4}{20}+\frac{9}{30}+\frac{4}{16}+\frac{25}{50}+\frac{36}{60}-x=2\)
\(\frac{1}{10}+\frac{1}{5}+\frac{3}{10}+\frac{1}{4}+\frac{1}{2}+\frac{3}{5}-x=2\)
\(\left(\frac{1}{10}+\frac{1}{5}+\frac{3}{10}+\frac{1}{4}+\frac{1}{2}+\frac{3}{5}\right)-x=2\)
\(\frac{39}{20}-x=2\)
\(x=\frac{39}{20}-2\)
\(x=\frac{-1}{20}\)
\(\frac{5}{6}+\frac{1}{12}+\frac{2}{3}+\frac{2}{7}+\frac{1}{25}+\frac{1}{4}-\frac{5}{42}\)
\(=\left(\frac{5}{6}+\frac{2}{7}-\frac{5}{42}\right)+\left(\frac{1}{12}+\frac{2}{3}+\frac{1}{4}\right)+\frac{1}{25}\)
\(=\left(\frac{35}{42}+\frac{12}{42}-\frac{5}{42}\right)+\left(\frac{1}{12}+\frac{8}{12}+\frac{3}{12}\right)+\frac{1}{25}\)
\(=\frac{42}{42}+\frac{12}{12}+\frac{1}{25}=1+1+\frac{1}{25}=2\frac{1}{25}\)
25 x 4 = 100 bánh
128 -100 = 28
28 : 4 =7 xe lớn
25 - 7 = 18 xe nhỏ
thử 7 x 8 = 56
18 x 4 = 72
56 + 72 = 128 bánh
Nếu : 2 x X + 1 = 8
Thì : 4 x X + 1 = ?
Ta có:
2 x X + 1 = 8
2 x X = 8 - 1
2 x X = 7
X = 7 : 2
X = 3,5
Vậy X = 3,5 ...
Nên: 4 x 3,5 + 1
= 14 + 1
= 15
... Vậy: 4 x X + 1 = 15
~ Hok T ~
x+y+z=4,5*2=9
x+y=8,2
=>z=0,8
y+z=4,9*2=9,8
=>y=9
=>x=-0,8
\(y\)x\(8+y+\frac{25}{100}=36,09+\frac{1}{4}\)
<=>\(9\)x\(y=36,09+\frac{1}{4}-\frac{25}{100}\)
<=>9 x\(y=36,09\)
<=>\(y=4,01\)
vậy \(y=4,01\)