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Cách 1 :\(\left(\frac{6}{11}+\frac{5}{11}\right)\times3=\frac{11}{11}\times3=1\times3=3\)
Cách 2 : \(\left(\frac{6}{11}+\frac{5}{11}\right)\times3=\left(\frac{6}{11}\times3\right)+\left(\frac{5}{11}\times3\right)\)
=\(\frac{18}{11}+\frac{15}{11}=\frac{33}{11}=3\)
cách 1:
(6/11+5/11)*3=1*3=3
cách 2:
(6/11+5/11)*3=6/11*3+5/11*3=18/11+15/11=33/11=3
cho mình **** nha
125 x 9,6 + 125 x 0,4
= 125 x ( 9,6 + 0,4 )
= 125 x 10
= 1250
*** nhé !
1. \(\frac{14}{45}=\frac{1}{9}+\frac{1}{5}\)
2. \(\left(1-\frac{1}{12}\right).\left(1-\frac{1}{11}\right).\left(1-\frac{1}{10}\right).\left(1-\frac{1}{9}\right).\left(1-\frac{1}{8}\right)\)
\(=\frac{11}{12}.\frac{10}{11}.\frac{9}{10}.\frac{8}{9}.\frac{7}{8}\)
Triệt tử với mẫu:
\(=\frac{7}{12}\)
1.ket qua la 1/5+1/9
2.=11/12x10/11x9/10x8/9x7/8
=(11x10x9x8x7)/(12x11x10x9x8)
=7/12
\(=\dfrac{16+25}{20}\cdot\dfrac{3}{4}=\dfrac{41}{20}\cdot\dfrac{3}{4}=\dfrac{123}{80}\)
A =(1/2:3/2)-(1/2X2/3)
=(1/2X2/3)-(1/2X2/3)
=1/3-1/3
= 0
tik cho mik
\(\frac{4}{5}+\frac{2}{35}\times\frac{7}{2}=\frac{4}{5}+\frac{1}{5}=1\)
\(\frac{4}{5}+\left(\frac{1}{5}-\frac{1}{7}\right):\frac{2}{7}\)
\(=\left(\frac{4}{5}+\frac{1}{5}\right)-\frac{1}{7}:\frac{2}{7}\)
\(=\frac{5}{5}-\frac{1}{2}\)
\(=1-\frac{1}{2}=\frac{1}{2}\)
\(\left(\frac{1}{3}-\frac{1}{5}\right)\times\frac{1}{2}=\frac{1}{6}-\frac{1}{10}\)
\(=\frac{1}{15}\)
\(\left(\frac{1}{3}-\frac{1}{5}\right)\times\frac{1}{2}=\frac{2}{15}\times\frac{1}{2}=\frac{1}{15}\)
Cách 1:
\(\left(9,6-4,2\right)\times3,6\)
\(=5,4\times3,6\)
\(=19,44\)
Cách 2:
\(\left(9,6-4,2\right)\times3,6\)
\(=9,6\times3,6-4,2\times3,6\)
\(=34,56-15,12\)
\(=19,44\)
re the ma ko biet lam