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7/8 x 1/4 + 7/8 x 2/4 + 7/8
=7/8 x\(\left(\dfrac{1}{4}+\dfrac{2}{4}\right)\) + 7/8
=7/8 x 3/4 + 7/8
=7/8 x \(\left(\dfrac{3}{4}+1\right)\)
=7/8 x 7/4
=49/32
`18/27-8/27`
`=10/27`
`4/7xx2/5`
`=8/35`
`3/4:2/7`
`=3/4xx7/2`
`=21/8`
\(\dfrac{3}{5}+\dfrac{7}{8}=\dfrac{3.8+7.5}{5.8}=\dfrac{24+35}{40}=\dfrac{59}{40}\\ 2+\dfrac{3}{4}=\dfrac{2.4+3}{4}=\dfrac{11}{4}\\ 1-\dfrac{3}{4}=\dfrac{4-3}{4}=\dfrac{1}{4}\\\dfrac{6}{8}+7=\dfrac{6+7.8}{8}=\dfrac{62}{8}=\dfrac{31}{4}\\ \dfrac{35}{9}-2=\dfrac{35-2.9}{9}=\dfrac{17}{9}\)
Giải thích : \(\left(.\right)\) dấu chấm này là dấu nhân nhé
a: \(=\left(\dfrac{4}{9}+\dfrac{5}{9}\right)+\left(\dfrac{1}{8}+\dfrac{7}{8}\right)=1+1=2\)
b: \(=\left(\dfrac{1}{6}+\dfrac{4}{6}+\dfrac{7}{6}\right)+\left(\dfrac{5}{12}+\dfrac{7}{12}\right)=2+1=3\)
\(\dfrac{8}{7}:\dfrac{3}{14}x\dfrac{4}{3}:\dfrac{7}{8}-\dfrac{24}{7}=\left(\dfrac{24}{7}-\dfrac{8}{7}\right)\)
mik chỉ bít thế thui
7/5+4/5 7/20-1/4 5/4x3/9 7/2 : 8
=7+4/5 =7/20-5/20 =5/4x1/3 =7/2x 1/8
=11/5 =7-5/20 =5/12 =7/16
= 1/10
Nhớ tick đấy
\(A=\frac{3}{7}+\frac{4}{9}+\frac{4}{7}+\frac{7}{11}\)
\(A=1+\frac{4}{9}+\frac{7}{11}\)
\(A==\frac{76}{33}\)
\(B=\frac{1}{8}+\frac{1}{12}+\frac{3}{8}+\frac{5}{12}\)
\(B=\frac{1}{2}+\frac{1}{2}\)
\(B=\frac{1}{4}\)
4 x 7/8 = 28/8 = 7/2
7/2 nha