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a) \(1678\cdot24+77\cdot1678-1678=1678\left(24+77-1\right)=167800\)
b) Ta có: \(\dfrac{2}{5}+\dfrac{4}{11}+\dfrac{3}{5}+\dfrac{18}{11}+\dfrac{1}{4}+\dfrac{1}{6}\)
\(=\left(\dfrac{2}{5}+\dfrac{3}{5}\right)+\left(\dfrac{4}{11}+\dfrac{18}{11}\right)+\dfrac{1}{4}+\dfrac{1}{6}\)
\(=3+\dfrac{1}{4}+\dfrac{1}{6}\)
\(=\dfrac{36}{12}+\dfrac{3}{12}+\dfrac{2}{12}=\dfrac{41}{12}\)
\(\frac{5}{9}x\frac{4}{7}+\frac{5}{9}x\frac{3}{7}\)
\(=\frac{5}{9}x\left(\frac{4}{7}+\frac{3}{7}\right)\)
\(=\frac{5}{9}x1\)
\(=\frac{5}{9}\)
Ta có: 9 x 5 + 45 - 9 x 2 + 18
= 45 + 45 - 18 + 18
= 90 - 36
= 54
a) 2/6 x 7/5
= 1/3 x 7/5
= 7/15
b) 11/9 x 5/10
= 11/9 x 1/2
= 11/18
c) 3/9 x 6/8
= 1/3 x 3/4
= 1/4
Chúc em học giỏi !
2/6 x 7/5 = 1/3 x 7/5 = 7/15
11/9 x 5/10 = 11/9 x 1/2 = 11/18
3/9 x 6/8 = 1/3 x 3/4 = 3/12 = 1/3
Tíck mk nha !!
a: \(=\dfrac{3}{5}+\dfrac{2}{7}=\dfrac{21+10}{35}=\dfrac{31}{35}\)
b: \(=\dfrac{6}{5}+\dfrac{3}{2}\cdot\dfrac{1}{3}=\dfrac{6}{5}+\dfrac{1}{2}=\dfrac{12+5}{10}=\dfrac{17}{10}\)
c: \(=\dfrac{5\cdot3}{9}=\dfrac{5}{3}\)
d: =5-2/3*6/5
=5-12/15
=5-4/5
=21/5
a)2/5+3/10-1/2=7/10-1/2=2/10=1/5
b)8/11+8/33x3/4=8/11+2/11=10/11
c)7/9x3/14:5/8=1/6:5/8=8/30+4/15
d)5/12-7/32:21/16=5/12-1/6=3/12
nha
a) 2/5+3/10-1/2
= 4/10+3/10-5/10
= 2/10 = 1/5
b) 8/11+8/33x3/4
= 8/11+2/11
= 10/11
c) 7/9x3/14:5/8
= 1/6:5/8
= 1/6x8/5
=4/15
d) 5/12-7/32:21/16
= 5/12-7/32x16/21
= 5/12-1/6
= 5/12-2/12
= 3/12
9x6=54
9x5=45
9x4=36
9x3=27
9x2=18
9x1=9
k mình nhé chúc năm mới vui vẻ ^.^
9x6=54
9x5=45
9x4=36
9x3=27
9x2=18