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\(\dfrac{6}{13}.\dfrac{5}{7}+\dfrac{6}{13}.\dfrac{2}{7}+\dfrac{7}{13}=\dfrac{6}{13}.\left(\dfrac{5}{7}+\dfrac{2}{7}\right)+\dfrac{7}{13}=\dfrac{6}{13}.1+\dfrac{7}{13}=\dfrac{6}{13}+\dfrac{7}{13}=\dfrac{13}{13}=1\)
#Monster
\(\dfrac{6}{13}\).(\(\dfrac{2}{7}+\dfrac{5}{7}\))+\(\dfrac{7}{13}\)
\(\dfrac{6}{13}\).1+\(\dfrac{7}{13}\)
\(\dfrac{6}{13}\)+\(\dfrac{7}{13}\)
1
Lời giải:
a. $=13-47-13-59+81+35-13$
$=(13-13-13)-(47+59)+(81+35)$
$=-13-106+116=-13+(116-106)=-13+10=-3$
b.
$=345-61+84+61-116-345$
$=(345-345)+(-61+61)-(116-84)$
$=0+0-32=-32$
1/13.(8/13-5/13)+14/13
1/13.3/13+14/13
3/13+14/13
17/13
NHƯ VẦY ĐÓ BẠN MIK CŨNG HỌC LỚP 6 NHƯ BẠN ĐÓ
\(\dfrac{11}{15}+\dfrac{7}{13}-\left(\dfrac{13}{15}+\dfrac{7}{13}\right)\)
\(=\dfrac{11}{15}+\dfrac{7}{13}-\dfrac{13}{15}-\dfrac{7}{13}\)
\(=\left(\dfrac{11}{15}-\dfrac{13}{15}\right)+\left(\dfrac{7}{13}-\dfrac{7}{13}\right)\)
\(=\dfrac{-2}{15}+0\)
\(=\dfrac{-2}{15}\)
#DatNe
= 11/15+7/13-13/15+7/13
= (11/15-13/15) + 7/13
= (-2/15)+7/15
= 5/15
= 1/3
114
11
5700 : 50 = 114
143 : 13 = 11