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a,\(\frac{2}{5}+\frac{3}{4}=\frac{8+15}{20}=\frac{23}{20}\)
\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}=(\frac{7}{12}+\frac{1}{12})-\frac{2}{7}\)
\(=\frac{2}{3}-\frac{2}{7}=\frac{14-6}{21}=\frac{8}{21}\)
\(\frac{12}{17}-\frac{5}{17}-\frac{4}{17}=\frac{7}{17}-\frac{4}{17}=\frac{3}{17}\)
b,\(675,39+342,14=1017,53\)
\(563,87+403,13-328,35=638,65\)
2/5+3/4=23/20
7/12-2/7+1/12=8/21
12/17-5/17-4/173/17
675,39+342,14=1017,53
563,87+403,13-328,35=638,65
12,7:4 = 3,175 ; 12:6,13 = 1,957585644 ; 9:3,5*4,15 = 10,67142857
12/17 : 4 = 12/17 * 1/4 = 12/68 = 6/34
12 : 6/13 = 12/1 * 13/6 = 156/6 = 26
9 : 3/5 * 4/15 = 9/1 * 5/3 * 4/15 = 15/1 * 4/15 = 60/15 = 4
Câu 2:
\(\dfrac{7}{9}\cdot\dfrac{3}{35}=\dfrac{1}{5}\cdot\dfrac{1}{3}=\dfrac{1}{15}\)
\(\dfrac{9}{22}\cdot55=\dfrac{9\cdot55}{22}=\dfrac{9\cdot5}{2}=\dfrac{45}{2}\)
5/7-4/9=17/63
3/8+9/5=87/40
1-5/9=4/9
7/12-2/7+1/12=8/21
12/17-5/17-4/17=3/17
2 - 5/6= 7/6
7/8+3/4=`13/8
2/5+3/4=23/20
7/12 - 2/7 + 1/12=8/21
12/17 - 5/17 - 4/17=3/17
1.Tính :
\(\frac{12}{17}\):6=\(\frac{2}{17}\); 16:\(\frac{8}{11}\)=\(\frac{2}{11}\); 9:\(\frac{3}{5}\)x\(\frac{4}{15}\)=\(\frac{3}{5}\)x\(\frac{4}{15}\)=\(\frac{4}{25}\)
=12/17×1/6
=2/17
=16/1×11/8
=22
9/1×5/3×4/15
15/1×4/15
4/1
2/3+4/5=10/15+12/15=22/15
4/6+8/12=8/12+8/12=16/12=4/3
99/17+100/17=199/17
67/12-7/6=67/12-14/12=53/12
65/18-8/6=65/18-24/18=41/18
\(\frac{2}{3}+\frac{4}{5}=\frac{22}{15}\)
\(\frac{4}{6}+\frac{8}{12}=\frac{4}{3}\)
\(\frac{99}{17}+\frac{100}{17}=\frac{199}{17}\)
\(\frac{67}{12}-\frac{7}{6}=\frac{53}{12}\)
2/5 + 3/4 = 23/40
7/12 - 2/7 + 1/12 = 25/84 + 1/12 = 8/21
12/17 - 5/17 - 4/17 = 3/17
OK
\(\frac{2}{5}+\frac{3}{4}=\frac{8}{20}+\frac{15}{20}=\frac{23}{20}\)
\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}=\left(\frac{7}{12}+\frac{1}{12}\right)-\frac{2}{7}=\frac{2}{3}-\frac{2}{7}=\frac{14}{21}-\frac{6}{21}=\frac{8}{21}\)
\(\frac{12}{17}-\frac{5}{17}-\frac{4}{17}=\frac{12-5-4}{17}=\frac{3}{17}\)
a) = 17/19 - 17/19 + 27/35 + 35/35 = 0 + 62/35
b) = 1/3 x 4/5 + 1/3 x6/5 + 1/3 x 2 = 1/3(4/5 + 6/5 + 2) = 1/3 x 4 = = 4/3
c) 4/7 x 2/9 + 4/7 x 7/9 + 2/3 = 4/7 x (2/9 + 7/9) + 2/3 = 4/7 x 1 + 2/3 = 26/21
A) 17/19 - 17/19 + 27/35 + 35/35 = 0 + 62/35
B) 1/3 x 4/5 + 1/3 x 6/5 + 1/3 x 2 = 1/3 x(4/5 + 6/5 x 2 ) = 1/3 x 4 = 4/3
c) TƯƠNG TỰ CÂU A VÀ B
* HOKTOT*
NHA
12/17:6=2/17
16:8/11=22
9:3/4x4/15=12x4/15=16/5=3,2