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a,( 3/29 - 1/5 ) x 29/3
=(15/145-29/145)x29/3
=(-14/145)x29/3
=-406/435
=-14/15
b,4 x 11 x 3/4 x 9/121
=4 x 11 x 3x9/1x1x4x121
=1188/484
=59/242
k mk nha
A / ( 3/29 - 1/5 ) x 29/3 = -14/145 x 29/3 = -14/15 B/ 4 x 11 x 3/4 x 9/121 = (4 x 11) x ( 3/4 x 9/121 ) = 44 x 27/484 =27/11 xong rồi đó
Giải:
a) \(2\dfrac{17}{20}-1\dfrac{15}{11}+6\dfrac{9}{20}:3\)
\(=\dfrac{57}{20}-\dfrac{26}{11}+\dfrac{129}{20}:3\)
\(=\dfrac{107}{220}+\dfrac{43}{20}\)
\(=\dfrac{29}{11}\)
b) \(4\dfrac{3}{7}:\left(\dfrac{7}{5}.4\dfrac{3}{7}\right)\)
\(=\dfrac{31}{7}:\left(\dfrac{7}{5}.\dfrac{31}{7}\right)\)
\(=\dfrac{31}{7}:\dfrac{31}{5}\)
\(=\dfrac{5}{7}\)
c) \(\left(3\dfrac{2}{9}.\dfrac{15}{23}.1\dfrac{7}{29}\right):\dfrac{5}{23}\)
\(=\left(\dfrac{29}{9}.\dfrac{15}{23}.\dfrac{36}{29}\right):\dfrac{5}{23}\)
\(=\dfrac{60}{23}:\dfrac{5}{23}\)
\(=12\)
a: \(\dfrac{-11}{18}+\dfrac{12}{29}+\dfrac{-7}{18}+\dfrac{2020}{2021}+\dfrac{17}{29}\)
=(-11/18-7/18)+(12/29+17/29)+2020/2021
=2020/2021
b: \(\dfrac{-2}{3}\cdot\dfrac{4}{9}+\dfrac{5}{9}\cdot\dfrac{-2}{3}+\dfrac{4}{3}\)
=-2/3+4/3=2/3
a)15/16:3/8x3/4
=15/16:6/16x12/16
=15/16x16/6x12/16
=15/6x12/16
=30/16=15/8
b)5/11x18/29-5/11x8/29+5/11x19/29
=5/11x(18/29-8/29+19/29)
=5/11x1=5/11
Bài 1 d)
\(1-2+3-4+5-6+...+2013\)
\(=1+\left(-2+3\right)+\left(-4+5\right)+...+\left(-2012+2013\right)\)
\(=1+1+1+...+1\left(1006s\right)\)
\(=1006.1=1006\)
a: =>4/3x=7/9-4/9=1/3
=>x=1/4
b: =>5/2-x=9/14:(-4/7)=-9/8
=>x=5/2+9/8=29/8
c: =>3x+3/4=8/3
=>3x=23/12
hay x=23/36
d: =>-5/6-x=7/12-4/12=3/12=1/4
=>x=-5/6-1/4=-10/12-3/12=-13/12
dau . la nhan nha em
a) \(\left(\frac{3}{29}-\frac{1}{5}\right).\frac{29}{3}=\frac{29}{3}.\frac{3}{29}-\frac{1}{5}.\frac{29}{3}=1-\frac{29}{15}=\frac{-14}{15}\)
b)\(4.11.\frac{3}{4}.\frac{9}{121}\)
\(=\left(4.\frac{3}{4}\right).\left(11.\frac{9}{121}\right)\)
\(=3.\frac{9}{12}\)
\(=\frac{9}{4}=2\frac{1}{4}\)