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7/9 - 3/7 + 2/3 - 4/7
= 7/9 + 2/3 - ( 4/7 + 3/7 )
= 13/9 - 1
= 4/9
8,12 x 6 + 16,24 x 4 - 4,06 x 8
= 8,12 x 6 + 8,12 x 2 x 4 - 8,12 : 2 x 8
= 8,12 x 6 + 8,12 x 8 - 8,12 x 4
= 8,12 x ( 6 + 8 - 4 )
= 8,12 x 10
81,2
Ủng hộ nhé ! Chúc bạn học giỏi !
7/9 - 3/7 + 2/3 - 4/7
= 7/9 + 2/3 - 3/7 - 4/7
= 7/9 + 2/3 - [ 3/7 + 4/7 ]
= 13/9 - 1
= 4/9
8,12 * 6 + 16,24 * 4 - 4,06 * 8
= 8,12 * 6 + 8,12 * 2 * 4 - 4,06 * 2 * 4
= 8,12 * 6 + 8,12 * 8 - 8,12 * 4
= 8,12 * [ 6 + 8 - 4 ]
= 8,12 * 10
= 81,2
CHÚC CÁC BẠN THÀNH CÔNG . Nhớ k cho mình nhiều nhiều nhé !
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a) (25x32) : 8
= 25 x (4 x 8) : 8
= (25 x 4) x (8:8)
= 100 x 1
=100
b, 24 x 11 + 6 x 86 x 4 + 72
= 24 x 11 + (6 x 4) x 86 + 24 x 3
= 24 x 11 + 24 x 86 + 24 x 3
= 24 x (11+86+3)
= 24 x 100
= 2 400
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A=\(\frac{2}{1}\cdot3+\frac{2}{3}\cdot5+\frac{2}{5}\cdot7+\frac{2}{7}\cdot9\)
A=\(\frac{3}{1}\cdot2+\frac{5}{3}\cdot2+\frac{7}{5}\cdot2+\frac{9}{7}\cdot2\)
A=\(2\cdot\left(3+\frac{5}{3}+\frac{7}{5}+\frac{9}{7}\right)\)
A=\(2\cdot\frac{772}{105}\)
A=\(\frac{1544}{105}\)
A=\(14\frac{74}{105}\)
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9,3 x 6,7 + 9,3 x 3,3 = 9,3 x ( 6,7 + 3,3 )
= 9,3 x 10
= 93
7,8 x 0,35 + 0,35 x 2,2 = 0,35 x ( 7,8 + 2,2 )
= 0,35 x 10
= 3,5
Đáp án là:
a) 9,3 x 6,7 + 9,3 x 3,3
= 9,3 x (6,7+3,3)
= 9,3 x 10
= 93.
b) 7,8 x 0,35 + 0,35 x 2,2
= 0,35 x (7,8+2,2)
= 0,35 x 10
= 35
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\(a.=\frac{4}{13}\times\frac{13}{4}\times\frac{2}{3}\times\frac{3}{2}\)
\(=1\times1\)
\(=1\)
\(b.=\frac{19}{13}+\frac{7}{13}+\frac{14}{6}+\frac{4}{6}+\frac{1}{9}+\frac{17}{9}\)
\(=\frac{26}{13}+\frac{18}{6}+\frac{18}{9}\)
\(=2+3+2\)
\(=7\)
4/13 * 2/3 * 13/4* 3/2= (4/13 * 13/4 )* (2/3 * 3*2) = 1*1=1
19/13 + 14/6 + 1/9 + 4/6 + 7/13 + 17/9 = (19/13 + 7/13) + (14/6 + 4/6) + (1/9 + 17/9) = 2 + 3 + 2 =7
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( 54 x 15 ) :9
=54:9x15
=90
( 56 x 23 x 4 ) :7
=56:7x23x4
=8x23x4
=32x23
=736
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a)7.(90+9+1)
=7.100
=700
b)3/4.(3/9+2/3)
=3/4.1
=3/4
a) ( 36 + 54 ) x 7 + 7 x 9 + 7
= ( 36 + 54 + 9 + 1 ) x 7
= 100 x 7
= 700
b) \(\frac{3}{4}\times\frac{3}{9}+\frac{3}{4}\times\frac{2}{3}\)
\(=\left(\frac{3}{9}+\frac{2}{3}\right)\times\frac{3}{4}\)
\(=1\times\frac{3}{4}\)
\(=\frac{3}{4}\)