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a) 3/5x7/8:10/9=21/40:10/9=189/400
b) 3 2/7x2 1/4:1 2/5=23/7x9/4:7/5=207/28:7/5=1035/196
c) 6/9+24/15+12/9+6/15=34/15+12/9+6/15=18/5+6/15=4
d) 3 2/9-( 1 5/8+1 2/9 )=29/9-(13/8+11/9)=29/9-205/72=3/8
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a) 3/5x7/9+11/9x3/5
=3/5 x(7/9+11/9)
= 3/5x2
=6/5
b)14/13:1/2+3/13x2-2x7/13
= 14/13 x 2 +3/13 x2 - 2x7/13
=2 x (14/13 +3/13 -7/13)
= 2 x 10/13
= 20/13
a) 3/5 x 7/9 + 11/9 x 3/5 - 3/10
= 3/5 x 7/9 + 11/9 x 3/5 - 3/5 x 2
= 3/5 x ( 7/9 + 11/9 - 2 )
= 3/5 x 0
= 0
b) 14/13 : 1/2 + 3/13 x 2 - 2 x 7/13
= 14/13 x 2/1 + 3/13 x 2 - 2 x 7/13
= ( 14/13 + 3/13 - 7/13 ) x 2
= 10/13 x 2 = 20/13
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a) C1: 8/15 : 4/5 + 7/15 : 4/5 C2: 8/15 : 4/5 + 7/15 : 4/5
= (8/15 + 7/15) :4/5 = 2/3 + 7/12
= 1 : 4/5 =5/4
= 5/4
b) C1: (5,8 + 4,7) : 0,25 C2: (5,8 + 4,7) : 0,25
= 10,5 : 0,25 = 5,8 : 0,25 + 4,7 : 0,25
= 42 = 23,2 + 18,8
= 42
c)C1: (7/3 - 2/3) : 4/9 C2: (7/3 - 2/3) : 4/9
= 5/3 : 4/9 = 7/3 : 4/9 - 2/3 : 4/9
= 15/4 = 21/4 - 3/2
= 15/4
d) C1: 0,08 : 0,16 - 0,04 : 0,16 C2: 0,08 : 0,16 - 0,04 : 0,16
= 1/2 - 1/4 = (0,08 - 0,04) : 0,16
= 1/4 = 0,04 : 0,16
=1/4
Nhớ k mình nha
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9/8 : 27/16 =2/3
C1: 9/5:17/15 + 8/5 : 17/15
= 27/15 + 24/15
=3
C2: 9/5 : 17/15 + 8/5 : 17/15
= ( 9/5 + 8/5 ) : 17/15
= 17/5 : 17/15
= 3
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a) Cách 1
\(\frac{8}{15}:\frac{2}{3}+\frac{7}{15}:\frac{2}{3}\)
\(=\frac{8}{15}.\frac{3}{2}+\frac{7}{15}.\frac{3}{2}\)
\(=\frac{4}{5}+\frac{7}{10}=\frac{3}{2}\)
Cách 2
\(\frac{8}{15}:\frac{2}{3}+\frac{7}{15}:\frac{2}{3}\)
\(=\left(\frac{8}{15}+\frac{7}{15}\right).\frac{3}{2}\)
\(=1.\frac{3}{2}=\frac{3}{2}\)
a) C1: 8/15 : 2/3 + 7/15 : 2/3
= 4/5 + 7/10
= 3/2
C2: 8/15 : 2/3 + 7/15 : 2/3
= ( 8/15 + 7/15 ) : 2/3
= 1 : 2/3
= 3/2
b) C1: 4/9 x 3/5 + 5/9 x 3/5
= 4/15 + 1/3
= 3/5
C2: 4/9 x 3/5 + 5/9 x 3/5
= ( 4/9 + 5/9 ) x 3/5
= 1 x 3/5
= 3/5
Chúc bạn học tốt :)