5 + 5 x 3 + 5 x 6 = ??
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a, 48/64 + 7/4
= 3/4 + 7/4
= 10/4
b, 3/8 + 119/56
= 3/8 + 17/8
= 20/8
a)48/64=3/4
3/4+7/4=10/4=5/2
b) 119/56=119:7/56:7=17/8
3/8+17/8=20/8=5/2
k mk nghen ^.-
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\(\frac{1}{10}+\frac{1}{30}+\frac{1}{60}+\frac{1}{100}+\frac{1}{150}\)
= \(\frac{1}{10}.\left(1+\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+\frac{1}{15}\right)\)
= \(\frac{1}{10}.2.\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}\right)\)
= \(\frac{1}{5}.\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}\right)\)
= \(\frac{1}{5}.\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\right)\)
= \(\frac{1}{5}.\left(1-\frac{1}{6}\right)\)
= \(\frac{1}{5}.\frac{5}{6}\)
= \(\frac{1}{6}\)
\(\frac{1}{10}+\frac{1}{30}+\frac{1}{60}+\frac{1}{100}+\frac{1}{150}\)
\(=\frac{1}{10}.\left(1+\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+\frac{1}{15}\right)\)
\(=\frac{1}{10}.2.\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}\right)\)
\(=\frac{1}{10}.2.\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}\right)\)
\(=\frac{1}{10}.2.\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\right)\)
\(=\frac{1}{5}.\left(1-\frac{1}{6}\right)\)
\(=\frac{1}{5}.\frac{5}{6}\)
\(=\frac{1}{6}\)
Rất vui vì giúp đc bạn <3
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\(\frac{14}{70}\) = \(\frac{2}{10}\)
\(\frac{75}{300}\) = \(\frac{25}{100}\)
\(\frac{14}{70}=0,2\)
\(\frac{75}{300}=0,25\)
< Chúc bn hok tốt >
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Số bị chia là: 24 x 8 + 7 = 199.
Đáp số:.....................................
Số bị chia của phép chia đó là:
24 x 8 + 7 = 199
Đáp số: 199
Rất vui vì giúp đc bạn <3
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a) (54 + 57) . (89 - 27) . (24 - 42)
= (54 + 57) . (89 - 27) . (16 - 16)
= (54 + 57) . (89 - 27) . 0
= 0
b) (72003 + 72002) : 72001
= 72003 : 72001 + 72002 : 72001
= 72 + 7
= 49 + 7
= 53
c) (169 - 42 ) × ( 169 - 52 ) ×......× ( 169 - 132)
= (169 - 42 ) × ( 169 - 52 ) ×......× ( 169 - 169)
= (169 - 42 ) × ( 169 - 52 ) ×......× 0
= 0
Tìm x biết
7 × ( x - 14 ) + 39 = 25 + 279 ÷ 9
=> 7 × ( x - 14 ) + 39 = 25 + 31
=> 7 × ( x - 14 ) + 39 = 56
=> 7 × (x - 14) = 56 - 39
=> 7 × (x - 14) = 17
=> x - 14 = 17 : 7
=> x - 14 = 17/7
=> x = 17/7 + 14
=> x = 115/7
\((5^4+4^7)\times(8^9-2^7)\times(2^4-4^2)\)
\(=(5^4+4^7)\times(8^9-2^7)\times0\)
\(=0\)
5 + 5 x 3 + 5 x 6
= 5 x 1 + 5 x 3 + 5 x 6
=5 x ( 1 + 3 + 6 )
=5 x 10
=50
\(5+5\times3+5\times6\)
\(=5\times(1+3+6)\)
\(=5\times10\)
\(=50\)