5/7x5/11+5/7x6/11-5/7x4/11
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=-2/7.(5/11+6/11)+-60/35
=-2/7.1+-12/7.1
=(-2/7+-12/7).1
=-14/7.1
=-2.1=-2
7x1=7
7x2=14
7x3=21
7x4=28
7x5=40
7x6=42
7x7=49
7x8=56
7x9=63
7x10=70
7x1=7
7x2=14
7x3=21
7x4=28
7x5=35
7x6=42
7x7=49
7x8=56
7x9=63
7x10=70
8507cm2
32m^2 217dm^2=320217
3/5 giờ 12 phút = 48 phút
\(\dfrac{3}{7}.\left(\dfrac{5-1}{4}\right)=\dfrac{3}{7}.1=\dfrac{3}{7}\)
\(\dfrac{11}{10}-\dfrac{6}{10}=\dfrac{5}{10}=\dfrac{1}{2}\)
\(\dfrac{8}{7}+\dfrac{-6}{7}.\dfrac{4}{11}-\dfrac{4}{11}.\dfrac{5}{11}\)
\(=\dfrac{8}{7}+\dfrac{4}{11}\left(-\dfrac{6}{7}-\dfrac{5}{11}\right)\)
\(=\dfrac{8}{7}+\dfrac{4}{11}.\dfrac{-101}{77}\)
\(=\dfrac{8}{7}+-\dfrac{404}{847}\)
\(=\dfrac{564}{847}\)
5 kg x 9 kg + 5 kg
=5 kg x (9kg + 1 kg)
=5kg x 10 kg
=50 kg
7x6-7x5
=7x(6-5)
=7x1
=7
49x11-49
=49x(11-1)
=49x10
=490
590:10=59
5 kg x 9 kg + 5 kg = 5 kg x 10 = 50 kg
7 x 6 - 7 x 5 = 7 x ( 6 - 5 ) = 7
49 x 11 - 49 = 49 x 10 = 490
590 : 10 = 59
a, \(\dfrac{38}{7}\) + ( \(\dfrac{16}{7}\) - \(\dfrac{5}{3}\))
= \(\dfrac{38}{7}\) + \(\dfrac{16}{7}\) - \(\dfrac{5}{3}\)
= \(\dfrac{54}{7}\) - \(\dfrac{5}{3}\)
= \(\dfrac{162}{21}\) - \(\dfrac{35}{21}\)
= \(\dfrac{127}{21}\)
b, \(\dfrac{29}{9}\) - ( \(\dfrac{14}{9}\) + \(\dfrac{11}{9}\) )
= \(\dfrac{29-14-11}{9}\)
= \(\dfrac{4}{9}\)
c, ( \(\dfrac{2}{7}\) + \(\dfrac{3}{8}\) + \(\dfrac{12}{7}\) + \(\dfrac{5}{8}\) ) - \(\dfrac{19}{63}\)
= ( \(\dfrac{2+12}{7}\) + \(\dfrac{3+5}{8}\)) - \(\dfrac{19}{63}\)
= \(\left(1+2\right)\) - \(\dfrac{19}{63}\)
= \(3-\dfrac{19}{63}\)
= \(\dfrac{189}{63}\) - \(\dfrac{19}{63}\)
= \(\dfrac{170}{63}\)
d, \(\dfrac{3}{7}\) . \(\dfrac{4}{9}\) + \(\dfrac{4}{9}\) . \(\dfrac{4}{7}\) - \(\dfrac{4}{9}\)
= \(\dfrac{4}{9}\) . ( \(\dfrac{3}{7}\) + \(\dfrac{3}{7}\) ) - \(\dfrac{4}{9}\)
= \(\dfrac{4}{9}\) . \(1-\dfrac{4}{9}\)
= \(\dfrac{4}{9}\) - \(\dfrac{4}{9}\)
= 0
3/11 x 2 = 6/11
6/11 : 3/11 = 2
6/11 : 2 = 3/11
2/3 x 11 = 22/3
4/2 x 7 = 14
8/7 : 2/7 = 4
8/7 : 4 = 2/7
2/7 x 4 = 8/7
2 x ( 2 + X ) - 11 = 6 : 3 + 7 x 5
2 x ( 2 + X ) - 11 = 2 + 35
2 x ( 2 + X ) - 11 = 37
2 x ( 2 + X ) = 37 + 11
2 x ( 2 + X ) = 48
2 + X = 48 : 2
2 + X = 24
X = 24 - 2
X = 22
Bài làm :
\(2\times\left(2+x\right)-11=6\div3+7\times5\)
\(\Leftrightarrow2\times2+2\times x=2+35+11\)
\(\Leftrightarrow4+2\times x=48\)
\(\Leftrightarrow2\times x=48-4=44\)
\(\Leftrightarrow x=44\div2=22\)
Vậy x=22
Chúc bạn học tốt !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
= 5/7 x (5/11 + 6/11 - 4/11)
=5/7 x 7/11
=5/11