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1.
\(\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)
\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1=1\)
\(\frac{2}{7}\cdot\frac{1}{5}+\frac{2}{7}\cdot\frac{4}{5}=\frac{2}{7}\cdot\left(\frac{1}{5}+\frac{4}{5}\right)=\frac{2}{7}\cdot1=\frac{2}{7}\)
#Louis
\(1.a)\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)
\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1\)
\(=1\)
\(b)\frac{2}{7}\times\frac{1}{5}+\frac{2}{7}\times\frac{4}{5}\)
\(=\frac{2}{7}\times\left(\frac{1}{5}+\frac{4}{5}\right)\)
\(=\frac{2}{7}\times1\)
\(=\frac{2}{7}\)
\(2.a)\frac{5}{6}+\frac{7}{12}-\frac{2}{9}\)
\(=\frac{30}{36}+\frac{21}{36}-\frac{8}{36}\)
\(=\frac{43}{36}\)
\(b)\frac{4}{9}\times\frac{5}{8}+\frac{1}{6}\)
\(=\frac{5}{18}+\frac{1}{6}=\frac{5}{18}+\frac{3}{18}\)
\(=\frac{8}{18}=\frac{4}{9}\)
\(c)2:\frac{3}{11}-\frac{13}{12}\)
\(=2\times\frac{11}{3}-\frac{13}{12}\)
\(=\frac{22}{3}-\frac{13}{12}\)
\(=\frac{25}{4}\)
=[(25*4)*(125*8)+(380+620)]:[(4*25:100)*(8*125)
=(100*1000+1000):(1*1000)
=101000:1000
=101
a) 23/42 - 10/21 c) 1/8 x 5
= 23/42 - 20/42 = 5x1/8
= 23-20/42 = 5/8.
= 3/42
= 1/14.
b) 3/7 + 3 d) 4 : 1/5
= 3/7 + 21/7 = 4 x 5
= 3+21/7 = 20.
=24/7.
a)8/18=4/9
4/9+5/4=16/36+45/36=61/36
b)8/24=1/3
12/28=3/7
1/3+3/7=7/21+9/21=16/21
8/7+10/21=24/21+10/21=34/21
a)=8/18+5/4=4/9+5/4=61/36
b)=8/24+12/28=1/3+3/7=16/21
8/7+10/21=34/21
2/3 : 1/2 + 1/3 : 1/2
= 4/3 + 2/3
= 2
3/5 : 4/7 : 7/6
= 21/20 : 7/6
= 9/10
4/9 x 7/5 : 7/9
= 28/45 : 7/9
= 4/5
Em nhớ k anh nha
có thể tính nốt phép tính 3/4 x 3/2 + 3/4 x 1/2 có đc ko ạ
Bai 1 :
5/18<2/3<7/9<5/6
Bai 2 :
A=15/16
B=1/10
C=5/24
D=5/7 tick nha tranvanloc
b, 3/5 + 4/7 + 2/8 + 10/25 + 9/21 + 28/16
= 3/5 + 4/7 + 2/8 + 2/5 + 3/7 + 14/8
= (3/5 + 2/5) + ( 4/7 + 3/7) + ( 2/8 + 14/8)
= 1 + 1 + 7/4
= 2 + 7/4 = 15/4
c , 8/7 + 7/6 + 5/8 + 10/12 + 24/28 + 6/16
= c , 8/7 + 7/6 + 5/8 + 5/6 + 6/7 + 1/2
= (8/7 + 6/7) + (7/6 + 5/6) + 5/8 + 1/2
= 14/7 + 12/6 + 5/8 + 1/2
= 2 + 2 + 5/8 + 1/2
= 4 + 9/8 = 41/8
9 X 8 X 35/ 25 X 9 X 32
= 3 X 3 X 4 X 2 X 5 X 7 / 5 X 5 X 3 X 3 X 4 X 2 X 4
= 7/20
NHỚ K MÌNH NHA!
\(\frac{9\times8\times35}{25\times9\times32}\)
\(=\frac{9\times8\times5\times7}{5\times5\times9\times8\times4}\)
\(=\frac{7}{5\times4}=\frac{7}{20}\)
a/c1 (8 x 23 ) : 4 = 184 : 4 = 46
c2 ( 8 x 23 ) : 4 = 8 x 23 : 4 = 46