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a)
C1: (8 x 3) : 24
= 24 : 24 = 1
C2: 8x3 : 24
= 8 : \(\frac{24}{3}\)= 1
b) C1 : (15x24) : 6
= 360 : 6
= 60
C2 : 15 x 24 : 6 = 15 x 4 = 60
cách 1 5/6-1/4-a/b=1/2 cách 2 5/6-1/4-a/b=1/2
7/12-a/b=1/2 a/b=5/6-1/4-1/2
a/b=7/12-1/2 a/b=1/12
a/b=1/12
c2
6/11 x 3/7+ 5/11 x 3/7
=18/77+15/77
=33/77 rut gon voi 11 = 3/7
a) Cách 1:
(6/7 - 4/7):2/5
=2/7 : 2/5
=5/7
Cách 2:
(6/7 - 4/7):2/5
=6/7:2/5 - 4/7:2/5
=15/7-10/7
=5/7
b) Cách 1:
8/15:2/11+7/15:2/11
=44/15+77/30
=165/30=11/2
Cách 2:
8/15:2/11+7/15:2/11
= (8/15+7/15):2/11
=1:2/11
=11/2
2/9+3/9+4/9+5/9+6/9+7/9
=2+3+4+5+6+7/9
=27/9
=3
1/6+4/9+5/6+11/16+5/9+5/16
=1/6+5/6+4/9+5/9+11/16+5/16
=1+1+1=3
hok tốt ~
1/4*1/2+1/6*1/2=1/8+1/12=20/96 C2 ( 1/4+1/6)*1/2
=10/24*1/2=10/48
b,(3/2-2/5)*1/3=11/10*1/3 C2 3/2*1/3+2/5*1/3
=3/6+2/15= 53/90
=11/30
\(\left(\frac{1}{4}+\frac{1}{6}\right)x\frac{1}{2}\) \(\left(\frac{3}{2}-\frac{2}{5}\right)x\frac{1}{3}\)
\(c1:=\frac{5}{12}x\frac{1}{2}=\frac{5}{24}\) \(c1:\frac{11}{10}x\frac{1}{3}=\frac{11}{30}\)
\(c2:=\frac{1}{4}x\frac{1}{2}+\frac{1}{6}x\frac{1}{2}\) \(c2:\frac{3}{2}x\frac{1}{3}-\frac{2}{5}x\frac{1}{3}\)
\(=\frac{1}{8}+\frac{1}{12}=\frac{12}{96}+\frac{8}{96}=\frac{20}{96}=\frac{5}{24}\) \(=\frac{1}{2}-\frac{2}{15}=\frac{11}{30}\)
CHÚC BẠN HỌC GIỎI
a: =2x23=46