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a. 4/9 + 3/7 = 55/63 ; 3/4 + 7/24 =25/24 ; 1/3 + 2/9 + 4/27 =5/9 + 4/27 =19/27; 4 : 9/5 : 10/3 =20/9 : 10/3 =2/3
b. 5/6 - 3/8 =11/24; 7/15 - 11/30 =1/10 ; 8 x 3/5 : 12/5 =24/5 : 12/5 = 2 ; 2/3 + 1/6 - 7/12 =5/6 - 7/12 = 1/4
c.2 x 3 x 8 / 4 x 5 x 6 x 7= 2/35 ; 36 x 22 x 51 / 11 x 17 x 72 = 3
\(a.\dfrac{3\times4\times7}{12\times8\times9}=\dfrac{3\times4\times7}{3\times4\times4\times2\times9}\\ =\dfrac{7}{4\times2\times9}=\dfrac{7}{72}\\ b.\dfrac{4\times5\times6}{12\times10\times8}=\dfrac{4\times5\times2\times3}{4\times3\times5\times2\times4\times2}=\dfrac{1}{8}\\ c.\dfrac{5\times6\times7}{12\times14\times15}=\dfrac{5\times6\times7}{2\times6\times7\times2\times5\times3}\\ =\dfrac{1}{2\times2\times3}=\dfrac{1}{12}\)
a)\(\dfrac{5}{7}+\dfrac{4}{9}=\dfrac{45}{63}+\dfrac{28}{63}=\dfrac{73}{63}\) ; \(\dfrac{9}{11}+\dfrac{3}{8}=\dfrac{72}{88}+\dfrac{33}{88}=\dfrac{105}{88}\)
\(\dfrac{4}{5}-\dfrac{2}{3}=\dfrac{12}{15}-\dfrac{10}{15}=\dfrac{2}{15}\); \(\dfrac{16}{25}-\dfrac{2}{5}=\dfrac{16}{25}-\dfrac{10}{25}=\dfrac{6}{25}\)
b)\(5+\dfrac{3}{5}=\dfrac{25}{5}+\dfrac{3}{5}=\dfrac{28}{5};10-\dfrac{9}{16}=\dfrac{160}{16}-\dfrac{9}{16}=\dfrac{151}{16}\)
\(\dfrac{2}{3}-\left(\dfrac{1}{6}+\dfrac{1}{8}\right)=\dfrac{2}{3}-\left(\dfrac{8}{48}+\dfrac{6}{48}\right)=\dfrac{2}{3}-\dfrac{14}{48}=\dfrac{32}{48}-\dfrac{14}{48}=\dfrac{3}{8}\)
a) \(\frac{16}{35}+\frac{8}{35}=\frac{24}{35}\)
b)\(\frac{160}{77}-\frac{28}{77}=\frac{132}{77}=\frac{12}{1}=12\)
c)\(\frac{72}{180}=\frac{18}{45}\)
d) \(\frac{90}{360}=\frac{1}{4}\)
1/5 + 1/6 + 1/7 + 1/8 + 1/9
= 1879/2520 và < 1
Chúc học tốt !
a)\(\frac{2}{3}:\frac{4}{9}+\frac{1}{3}:\frac{4}{9}\)
=\(\frac{4}{9}:\left(\frac{2}{3}+\frac{1}{3}\right)\)
=\(\frac{4}{9}:1=\frac{4}{9}\)
b
a]11/10
b]13/56
c]9/8
d]7/12
tick cho mình nha
a,2/5+7/10=11/10 b,6/7-5/8=13/56 c,3/5 x 15/8=9/8 d,1/4:3/7=7/12 HT
bằng 7/12 nha bn
a) \(\dfrac{2}{5}+\dfrac{7}{10}=\dfrac{4}{10}+\dfrac{7}{10}=\dfrac{11}{10}\)
b) \(\dfrac{6}{7}-\dfrac{5}{8}=\dfrac{48}{56}-\dfrac{35}{56}=\dfrac{13}{56}\)
c) \(\dfrac{3}{5}x\dfrac{15}{8}=\dfrac{45}{40}=\dfrac{9}{8}\)
d) \(\dfrac{1}{4}:\dfrac{3}{7}=\dfrac{1}{4}x\dfrac{7}{3}=\dfrac{7}{12}\)